Hi Help with sig please

Hi ,ok so i am completley useless on computers,and not so hot on spelling either [sure completley doesnt look right] .So if theres anyone out there willing to take pity on me and explain how everyone does these great sigs.
It would be much appreciated.Did manage to get a photo up,but think it was pure luck as have tried to change it and its having none of it.
Any ways soz to be a pain.

Hey!
Um I can't answer your question but how did you get the picture up? I can't...