Chase, go back to this first page and see Yaish's explanation.
This my version as a dummy;
1. log in to Photo Bucket account, upload your pics-if they aren't aready in there.
2.Under each pic is (ideally) three boxes-if there's only one, click "changing option' and three will appear.
3.Right click the bottom box under the pic (starts with IMG) that will 'copy' the pic. (whatever THAT means, doesn't matter). DON"T LOG OUT OF PHOTOBUCKET!
4.Now log on to Xmarks ; do your Quick Reply, words of wisdom etc.
5.Right cick, and a little menu appears, choose 'paste' and a Martian code/link whatever will appear under your reply text..
6. Then just hit the usual 'Reply' button and Magic! the post will appea,r and your pic where the Martian code was!

Be patient with yourself, you'll get it, I promise. I finally managed (but of course I'm brilliant at the best of times - and VERY HUMBLE with it!!!)