You need to choose 'go advanced' there you can choose 'manage files' max size is 640X480..
you can revise them with outlook 2003 installed; right click them with the mouse, choose send to email recipient; then choose 'show more options' now you can choose 640X480, drag and drop the files that appear in a new email window to the desktop or a folder, and upload them from there using the 'manage attachments' option on the forum.
That's about the easies way.
feel free to ask any question if it's not working.