Change logos for individual forums

[The Big Three]

I'm wondering, how can I change the logos for each of my forums? My website is a sports discussion site, and we want to get team logos next to each of the team forums. Here's what it looks like now (cut out the stuff around it):

https://vborg.vbsupport.ru/external/2008/11/66.jpg

We want the pictures to replace the little basketballer image, something like OTRBasketball.com or NBADimensions.net has it.

Please be as detailed as possible in your explanation, I'm still inexperienced at administrating a site, so what might be simple for you probably isn't for me.

Is there a specific mod I need to upload?

Thanks in advance.

[Dismounted]

What you are look for are Statusicon Prefixes:
https://vborg.vbsupport.ru/showthread.php?t=179139

[snakes1100]

What you want is this.

https://vborg.vbsupport.ru/showthread.php?t=102025

Works fine in 3.7.x

[Dismounted]

You don't need a modification for 3.7 - it's a default feature.