Well I'm assuming you bought Onyx. It tells you under each upgrade what you will be able to do.
Onyx:
Custom Onyx forum userbar
Custom Onyx forum award
Ability to give reputation (+/- 5 points)
Access to all private forums
Ability to open and close own threads
Can change their own username
Can change their own usertitle
Ability to give thread ratings
Can upload avatar icons
Can download thread attachments
Additional 2,400 message space