To access the UCP, click your name on the upper-right hand corner of the forum. A drop-down menu will give you some options including the UCP.
![Image](https://www.wundercomics.com/wunderland/graphics/forum21_ucp.jpg)
From the UCP you'll have many options including signatures and avatars. To change your avatar, click Profile in the menu which will take you to a new panel. From there, you'll see a drop-down with two options: Upload Avatar, if you want to use your own, or Gallery Avatar to select one I've uploaded to the forum.
![Image](https://www.wundercomics.com/wunderland/graphics/forum21_avmenu.jpg)