They're fontawesome, so you can change them in global.css and the forumbit templates.
Can you tell me exactly how to do it?
What do you want to change them to ?
This theme uses FA V4.
Looks like you should just be able to change it in the forumbit_depth2_forum AND forumbit_depth2_cat templates. Look for <i class="fa fa-circle-o"></i> and change it to what you want.
I have made my icons to add there..
I want to add the categories icons there..
I have made two icons for each category..
[attachment=42424]
There is a tutorial for that, in the tutorials forum.
I use a tutorial but there are all icons the same.. i cant change those