Note that WordPress.com and WordPress.org are completely separate sites with separate username accounts and logins. If you don't have a username account at WordPress.ORG click http://wordpress.org/support/ and register one on the top right hand corner of the page that opens, so you can post to the support forums there and receive advice from WordPress.ORG bloggers.

We cannot access metadata on free hosted WordPress.com blogs and insert any keyword meta tags. This is because our blogs are all on the same multiuser blogging platform and share a common architecture ie. every blog here wearing the same theme is using the same template, so we bloggers cannot edit templates and insert keywords. You can only access metadata on WordPress.org install as they are free standing installs. Read the differences here > http://en.support.wordpress.com/com-vs-org/

More to the point is the fact that Google does not use the keywords meta tag in web ranking and has not done so since at least 2009.
See Matts Cutts of Google state that in the videos in this post Revisiting Keywords and Tags

Also note he states that these days days search engines pay more attention to your keywords in your content than they do to your keywords in Tags/Categories. Note also that Google's algorithms can detect whether or not the keyword tags you assign to posts appear in the text of the post.

There is no FTP access to our free hosted WordPress.com blogs and we bloggers cannot install plugins.
http://en.support.wordpress.com/ftp-access/
http://en.support.wordpress.com/plugins/

The blog I need help with is futcherwolfsoccer.com.

Now, a Twitter card shows up like this, using the @wordpressdotcom handle:

https://twitter.com/roycornelissen/status/324670573739380737
This is because of the "twitter:" meta tags in the HTML:

<meta name="twitter:site" content="@wordpressdotcom" />
<meta name="twitter:card" content="summary" />
<meta name="twitter:creator" content="@wordpressdotcom" />

I want the twitter:creator tag to contain my own Twitter handle and there seems to be no way to influence this.

A WordPress blog can either be structured as a page based website or its conventional post based structure can be retained. That’s why understanding the differences between posts and pages, comprehending the SEO implications of creating a page based structure, rather than a post based structure and knowing how to use custom menus are key to decision making when selecting a theme, and setting up your WordPress.com blog.
http://onecoolsitebloggingtips.com/2010/05/12/better-blogging-at-wordpress-com-pages-and-posts/

As for your own site there's nothing new going on there. The site is not frequently updated with new material for indexing so it's not attracting search engine attention.

The WordPress.com search engine indexes post, pages, and comments content (body text). Unless entered as text in those contents, blog name, post titles, and post/comment author names are not indexed. http://en.support.wordpress.com/wordpresscom-search/

To verify blog ownership of a WordPress.com blog with the major search engines you must use this process > http://en.support.wordpress.com/webmaster-tools/ Note also that WordPress.com automatically supplies sitemaps for our blogs to search engines - we do nothing. http://en.support.wordpress.com/sitemaps/#xml-sitemaps-for-search-engines

WordPress.com SEO is very good and there is no need for any SEO the plugin. If you had two identical sites, one hosted here and one self-hosted using that same plugin, the site hosted here would have better SEO than the self-hosted site. WordPress.com has huge SEO and you get the benefit of that by having your site as a "subdomain" here.

These 5 videos introduce how Google discovers, crawls, indexes your site’s pages, and how Google displays them in search results. It also touches lightly upon challenges webmasters and search engines face, such as duplicate content http://onecoolsitebloggingtips.com/2010/03/22/5google-webmasters-video-tutorials/

If you are using a WordPress.com theme good SEO is a given. However, going beyond the theme what the blogger has done within that structure is worth evaluating. Whether you write informative, persuasive or controversial content learning how search engines work, and how to apply basic SEO to you content will benefit your blog as it will increase traffic from targeted readers. http://onecoolsitebloggingtips.com/2011/10/21/two-seo-videos-for-bloggers/

See also:
http://onecoolsitebloggingtips.com/2012/10/08/6-ways-to-make-google-your-blogs-best-friend/

The only process that we can use for verifying free hosted WordPress.com blogs with search engines is found here > http://en.support.wordpress.com/webmaster-tools/

WordPress.com automatically provides the search engines with sitemaps. There's nothing we bloggers need to do.
http://en.support.wordpress.com/sitemaps/

Even if you do not verify the blog the content will be indexed by search engines so don't feel panicky about this please. Also note it takes weeks of publishing unique content that cannot be found elsewhere on the interment for Bing and Google to index your content. For 10 factors that expedite indexing of your content see > http://onecoolsitebloggingtips.com/2010/01/21/omg-i-cant-find-my-blog-on-google/

There is no FTP access to our free hosted WordPress.com blogs and we bloggers cannot install plugins.
http://en.support.wordpress.com/ftp-access/
http://en.support.wordpress.com/plugins/

Please e-mail response to: [email redacted] or [email redacted]

Thank you.

2. purchase an annually renewable custom design upgrade and do the CSS editing to remove the tag display from Twenty Ten

my meta tags are shown at the bottom of my public page

They aren't meta tags. They are post tags.
Here are the reasons for non-appearance on the Topics ie. categories and tags pages http://en.support.wordpress.com/topics/#missing-posts

What you are doing (inadvertently) is called spamdexing AKA as tag spamming. The rule of thumb is assign the least number of relevant categories and tags to any post.

As you have assigned a combined total that exceeds 15 Categories/Tags to your posts, you need to edit and delete. http://en.support.wordpress.com/posts/edit-posts-screen/ After removal note it may take several days for your posts to begin displaying there.

For tips on tagging see > http://onecoolsitebloggingtips.com/2013/03/15/quick-blog-post-tagging-tips/

can I mask them?

Do you care if search engines like Google index your content?

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I don't particularly want WordPress.com having write permissions to my Twitter feed (which is partly the fault of Twitter's crappy permissions granularity, I do get that). So something more lightweight to provide this functionality would still be good.

In any case, thanks for the pointer, raincoaster,