OK. Now copy the URL address of the shot and paste it in the Signature window. But you have to remember about pasting it between IMG tags in order to be displayed.
Also the image could be clipped a little bit. The white parts aren't needed methinks.
I like the one you have up now, the one with the Colt .45 looks a bit like a guns and ammo cover and seems less of a tribute to your service, if you dont mind me saying ?