First off.

What is a Signature?
A signature is a chunk of Information that is present at the bottom of every post a person makes in the forums. :)

How do I make one?
It's simple!

Step 1: Select "My Controls" which is found on the upper right portion of the screen. You will then be transferred to another page.

Step 2: On the left side of the screen, the Menu can be seen. Select the "Edit Signature" Link under the "Personal Profile" Submenu.

Step 3: A new screen will appear and whoala, you can place text or even images as your signature!