After you have the image you want for your siggy hosted on a site that will allow you to link outside (photobucket or something like it) you just link to it with html.
To put it as a signature so you don\'t have to type it out every time, click on \"Character\" under the \"Control\" tab (on the right hand side of the screen). This will open your character setting page. On the top of the page click on \"Edit [your name]\'s profile\". Then in the box where it says \"Signature\" just type in the html that you need.