The picture with his computer stats is his signature. You need your posts to cross 100 before you're allowed a signature with picture/graphics. Also I'm pretty sure his sig is custom made by himself or someone else, so may be you can ask someone to make one for you.
Registered Users Extra BST (100 - 249 posts):
Same as above
Custom avatars allowed, 100x100
Graphics and text sigs allowed, maximum size of 300 x 100 (accoding to the rules)
Buy/Sell/Trade forum available