Look at this: http://www.xanga.com/home.aspx?user=My16sweetie

How does she fit the chatterbox, entries, and left module thingy all on the page, without having to scroll to the right for the chatterbox?

The entries are less than 600 px wide, and I tried to type 400 into the page width but it wouldn't let me. Is there a code so that I can fit a chatterbox on the right but it all completely visible? Right now I have mine in the header.

That's because the page width input in Look & Feel only allows 600 - 2000.

Try this:
<style>
table.blogbody {
width: 488px;}
</style>

Adjust the width to your liking.

thank you thank you thank you!!!!! It worked!!! :)