Note The option to add a sig. or signature picture becomes available after you've made a certain number of posts. I think it's 10 or 20, so the option may not be available to you yet.
To add a signature:
At the top of page click on the drop down menus, click on "Forum Actions"> "Edit profile"
On the edit profile page, look on the left under "My Settings"> "My Profile" click on "Edit Signature"
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