You could ad something before the word "theme like this:

.credit:before {
content: "I customized this ";
}

To turn comments off globally (for all subsequent content) go to settings > discussion and disallow comments and trackbacks.

For all existing content, you will have to turn comments off manually using either the quickedit function at pages > all pages and posts > all posts, or you can use the bulk edit feature and do a bunch at once.

http://en.support.wordpress.com/pages/edit-pages-screen/
http://en.support.wordpress.com/posts/edit-posts-screen/

td {
font-size: 90%;
letter-spacing: -1px;
}

.storytitle a {
color: #FFFFFF;
}

The code you have catches the post title on the single-post pages and catches the background color on the main and single-post pages.

If you see a three digit code, it is a short code for a repeating set. Example

667755 could be written as 675.

CC0011 could be written as C01

For the fonts in the tables, do something like this and then you can adjust the size as you see fit.

<em style="font-size: 90%;">the bull is released and, after menacing the crowd, dashes off between two trucks parked on the opposite side of the circle from where we were standing.</em>

or

<p style="font-size: 90%;">all the text here</p>

First, to change the color of text for the post title (h3). I have changed it in CSS so that each individual post title is white, like so:

h3 {
border-bottom:dotted 1px #eee;
font-family:'Lucida Grande', 'Lucida Sans Unicode', Verdana, sans-serif;
color:#ffffff;
background:#2e2e2e;
margin-top:10px;
padding:10px 5px 5px 10px;

But when I open the blog, and see all posts, the background is #2e2e2e, but the text color is still the green. I can't find the CSS to change that.

Next, I put my photos into tables that I enter as html code. I cannot control the size of the text that I type in the tables. I'll have a line in the table like <tr><td colspan="3">text</td><tr>, and although I've tried to put in font size tags, something in the CSS is overriding that so that the text in the tables is larger than the text in the body of the post. What do I need to do?

Also, I see a lot of three character color codes in the CSS, for example:

a {
color:#675;
}

I've tried to find them in an HTML/CSS color code chart, but they all require six characters.

Thanks!