lollllllllllllll okay- remember that drop down window? you go alllllll the up near the top to "user" click on that , then you will see to the left the "edit signature. Type whatever you want. Now to add a picture ( its the only time you have to use a outside source- copy one of your pictures from like tinypics etc but you want the line that says "/img" copy that line and put it in your text part of your message.
After that on your replies you use manage attachments to load from your computer.
This does seem like alot at first as everything is divided but you get the hang of it pretty quick, and we are here to help. People are really here!!!