MyBB Community Forums

Here is my forum display page

As you can see the thread list fills the width of the home page.

How can I add a column on the left for a long banner ad?

There are no plugins.

It can be in the actual thread list part or an added section on the left.

Cheers.

http://mybbcentral.com/thread-1697.html

That would probably be the easiest way.