What files do I update to edit these widths?

[FlyingBurrito4]

I want these to be 100% ...

http://img818.imageshack.us/img818/8806/forummi.jpg

http://img225.imageshack.us/img225/1471/forum2z.jpg

[Lynne]

Looks like the message width is set using this css:
.standard_error { margin: 0 auto; max-width: 600px; padding: 4em 0 6em;}
And, is that the registration page? (clicking the image just shows the same size image, so I can't tell). The width for those is from this CSS:
.vbform {
clear: both;
margin: 0px auto 2em;
max-width: 750px;
width: auto;}

[FlyingBurrito4]

Yes, registration form. The URL is http://www.nfldraftforum.com - I can't find where to set the CSS for .standard_error or .vbform

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I am sorry I posted in the wrong forum, it is vBulletin 3.8.6.