Sig Help!

i got some gay sigs that i have to use cuz i got no photoshop or w/e..(im using paint..welcome to help me)
but how do i put them from paint like from my pictures to my sig?
theres no browse button or n e thing..

thanks

for carification, photobucket is an image hosting site, you create an account and are able to store all the signatures or other images you have, then use the [ img ] code to input the url to your image (photobucket gives you the direct img coded link underneath teh image once you have uploaded it)