Image URLs.

Sven Svennson.

Time to shine, baby!
Banned User
How do I know what an image's URL is?
I wanna put one in my signature.

Marie Antoinette

La Reine de France
If you right-clicked and selected the 'Copy image location' of the image you want to use, then the IMG URL is already on your clipboard. All you need to do then is click the 'Insert Image' thing when you edit your signature and press ctrl-v (or command-v, if you use a Mac) to paste the URL in the box that pops up and click 'Insert'.