Your sharing icons show on the single post pages. Click on the title of one of your posts and you will see them at the bottom of your post.
To get them to show on the main page, you have to go back to settings > sharing and in the “Show sharing buttons on” pulldown, select “Posts, pages and index page” and save. The sharing icons will then also show on your main page.
One other thing, you need to go to users > personal settings and under “account details toward the bottom change the website URL to that of your new blog. That way when you happen to comment on another wordpress.com blog, your username will be linked to your new blog. Also, it makes it much easier for us here in the forums.