UBB.threads PHP Forum Software Community Forums UBB.classic UBB.classic 6 Support Avatar Question!

I'm having the UBB 6.04c and I can't find the option on the control panel, so as to enable the avatar's option!

How can I do to solve this.. Should I have to download any plug-in, or sth?

The URL of my forum is the following: click here!

Many thanks!