I can give you step-by-step instructions on how to insert a signature into your posts if that's what you're asking for. If you're asking for step-by-step photoshop instructions on how to edit an image and render it into a signature, that's out of my pay grade unfortunately. My best suggestion is to look around online for some photoshop tutorials or post in a free signature thread in The Artist's Corner.
I found a thread that showed you how to make one out of bbcode but it didnt teach me everything lol was more wondering if someone could tell me exactly how to do it or even use the bbcode itself like will this work Example; CFL cab grow[url/][color/]