ACP> Styles & Templates > Style manager
From there you'll get a list of themes you have. Click "Go" by the one you want to work on.
When it opens scroll down to Forum Width. Right now it should have a number like 500px or just the number. That dictates the width in pixels. Delete that and put 100% in it's place.
Press return and let the CSS page reboot itself. Then at the top click on Forum Home and see how it came out.
Be sure if you're done to log out of the ACP.
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