If you'd like to add a little photo (Avatar) that appears next to your name on posts and replies, here's all you need to do:
1. Prepare a small photo of yourself, no more than 80 pixels by 80 pixels
2. Click on the User CP link in the menu above.
3. Go to the Edit Avatar settings
4. Choose 'Use Custom Avatar' and click the 'Browse' button under Option 2.
5. Browse to where you saved the small photo of yourself (in point 1) and select it. Click Open to upload it.
6. Once uploaded click 'Save Changes'
There may be a slight delay before the photo shows against your profile/name in forum posts (this is just due to some caching the site uses). But within a few minutes it should display.
Any questions, just ask.