Right click on the one you want and save as- call it whatever you like or keep the same name
Try to save it to your My Pictures section so it is easy to find.
Then go to www.photobucket.com and make a free account.
Go to your album and click browse
Go find the graphic and select it
Click download and wait
Photobucket gives you a box with the graphic and 3 different URLs
The top one is a direct link to the graphic.
The bottom one is the one you would use for a forum like this one.