I'm assuming you want to put a picture in with your signature?
Right below your picture at photobucket there are three rows of codes. You need the bottom one. Highlight it and then right click and copy it. When you get to your signature box here at this site right click and paste. FIRST you need to choose edit at photobucket and make it smaller if you are going to use it as a signature picture. Goof around with it and see what you get.

The email pic you need to save it on your computer in docs or pics. Then when you are at photobucket hit browse and it will let you pick from docs or pics and find the picture and hit download.