How to Adjust the New Default Theme Forum Index Width ?

[Kingfish]

I am ok with my header and footer spanning the width of the users screen, but the forum itself seems to be too wide.  Is there a place to fix or adjust the width of this. On my laptop it seems to fill 95% off the screen making the posts too wide and making the content inside the posts appear thinner than it really is.  

I'd love to be able to fix the width of the forum itself to abut 920px, but I have no idea how to do that in this version.

[Mike-B]

This was answered for me here: http://community.mybb.com/thread-159319.html

Hope that helps