Quote Originally Posted by Caratacos
Save the desired pic on your computer then upload it to an imagehosting service (imageshack is good- no registration required) then paste the embeddable code (for forums) in your signature and save. Violà.
or you could just copy the image's location via link. Then put [IMG] in front and [/IMG] on the back like so: [IMG]-insert link here-[/IMG]. Thats how I did it anyway.