The way this forum is set up is not very picture friendly. You may only post one file at a time, unless I'm very mistaken, but I only see one box for a file. The file size must be less than 100K.
What might be a better alternative for you is to send the administrator of this site Jinn a private message and ask him about submitting your pics to the member's photo section.
Granted, though, if they are copyrighted and already distibuted materials from other sites, he won't be able to post them to this site.
As for shrinking your files and file sizes, every photo software is different. I use Paint Shop Pro 7 and it's very easy to do. You just load the image, click image info and then you can resize and reformat to any file type, size and color depth. I don't know if Adobe is that easy to use or not. Check the help file.