1) go to www.imageshack.us
2) click the litte browse button, find the picture you want, double click it, then press "host"
3) wait for the page to reload. when it does, there will be a ton of links. scroll down to the one all the way at the bottom, copy it
4) come here, go to your user control, edit sig, click the little yellow box that has a mountain looking thing in it. paste your link. or, you can just write it yourself: [IMG] paste your link [/IMG]. No spaces. Save, and enjoy. make sure the picture is sized properly, around 70kb at most