Searching on the board links you to either a great guide that was apparently....deleted (because that's helpful...) or a thread that gives you only half the information you need.
So I'm on the thread: http://xenforo.com/community/threads/bigger-avatar-on-postbit.9848/#post-299002
On the last post where it tells you how to do it. I made avatars to size "L". L???????? I need something more in the terms of actual size. Size "M" is way too small, size "L" is way to small....I tried size "N" but apparently that doesn't exist....
Then I see the post says this:
If you want a smaller avatar, you can use css to resize the image later.