I wouldn't worry about the CSS at all. Choose your settings in the basic thing there and then leave it. You only need some basic HTML to get a pretty spiffy profile going. I've thrown together a few items below. None of this deals with the CSS.
Code:
<p>HTML Time!</p>
<p>Here's some basic HTML! <br />
Check out this awesome <a href='http://www.ambercutie.com/forums">link</a>. <br />
Or this badass picture below!</p>
<img src='http://i.imgur.com/S3iGs.jpg' />
An HTML tag has < and > surrounding it.
The <p></p> tags define paragraphs. Enclosing text in these brackets define it as a paragraph, naturally setting it off from other elements on the page.
The <br /> tag is a line break.
The <a href=></a> tags create a hyperlink around texts, pictures, etc between the opening and closing tag.
The <img src= /> tag inserts a picture. You'll need to have the picture hosted to some place that allows the photo to be linked to (often known as hotlinking).
There's some basics. I HIGHLY recommend you take this and what Evvie has mentioned and play around with it a bit. While I'm sure she'd do a good job of it I personally feel it would be best if your wife or you could make modifications easily yourselves. You do not need to know very much HTML at all to make a nice profile. Many girls do it by simply choosing their customize settings carefully and the few tags I've included above.
NOTE TO GEEKS: Yes... I am lacking html, head, title, etc tags. Since it is all loaded in line with the rest of the profile, I don't think them necessary for his application. Some of it may even be deprecated by now. My only official study of HTML happened 15 years ago. Ever since I've just learned enough on my own to do the things I wanted at the time.