Neopets has a small html guide that may be of some assistance:
http://www.neopets.com/help/html1.phtml
Other than that...
Quote:
<b>text</b>
Using the b tags will make the text within them
bold the same can be done to get
italics (change the b's to i's) and
underlines (change the b's to u's).
Quote:
<img src="URL of your image" border="0">
Placing the URL of an image where this tag specifies will make the picture show-up on your page (as long as the image is on a server that allows offsite linking).
Quote:
<a href="URL">text</a>
Placing the URL of a page where this tag specifies will make the "text" show-up as a link to the other page.
Quote:
<br> and <p>
The br tag can be used to make a break in the line, for example:
Hello, how (break)
are you today?
The p tag can be used to skip onto the next line, for example:
Hello, how (next line)
are you today?