And seeing is NUM REMOVED THE BLOGS i can't make a blog on it.............jerk........lol
But a quick explanation is If you go to the Top of the webpage and click on your name, then go down to Signature, and in this block you'll see a Image option . "See imagine in post"
Here is where it gets tricky you will need to
A. Choose a picture and size it to fit how you want. - I used irfanview personally.
B. Upload it to a website to past the URL -
imgur: the simple image sharer - This is the easiest.
Once those 2 steps are done, simply click on the image option in your Signature and upload. Tada you got a pic!
It takes a little trial and error to get it the size you want, but not to horribly difficult!
Obviously if you have photoshop skills you can do what ever image you please and custom it how you please, mine is a image i found online and re-sized it to fit in my signature block.