MyBB Community Forums

For A Banner....

How do I to 'squeeze' the width of the entire forum so it'll fit.

For The Main Title Thingies....

How do I add images to the tables instead of colors? For backgrounds?

Like this....

I'm not exactly sure what you mean, but you can try going to Admin CP --> Themes --> Modify / Delete --> *Edit your theme* and changing the width setting in the "Page Container" section.

Scroll down in that same page, and you can add backgrounds for Table Border, Table Header, Table Footer, Table Alt. Row 1, Table Alt. Row 2, etc.