I think what he's asking is how to add an image signature to his posts...
Just a hunch, but I know the same thing threw me when I was first starting out. If that's what you're looking for, then go to My Controls > Edit Signature > and paste the link to your graphic, enclosing it in IMG tags.
Example:
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[img]http://www.sitename.host.com/mysignature.jpg[/img]
If, on the other hand, you're wanting to know how to create a signature, just google it. Or look at these example tutorials. They generally use Photoshop, but if you don't have that you can use pretty much any good image editing software. It comes down to a combination of skill and creativity.
Example tutorial:
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http://www.trap17.com/index.php/signature-tutorial_t32200.html
Lots of tutorials:
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http://www.sigtutorials.com/
Signature tutorial for GIMP:
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http://www.gimptalk.com/forum/topic/Full-Signature-Tutorial-5880-1.html
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