Attempt failed, I am afraid.
Keep it up and be sure to check the FAQs.
EDIT:
File Attachment is set to a maximum 2 megs limit. This means if your file is larger than 2 mb, you should split it up, using winrar, hacha or a media managing program such as videomach.
Also, let the server receive the file completely: even on broad band connections, it takes a while before the forum actually accepts your file.
Once added, you should wait it to appear on your list, before committing the post.
If everthing fails, check the moderators' list, pick the most active of them, and see if they have a public mail. Sent the file to them, and let the mods post the file.
Also, be sure you aren't trying to post files covered by copyrights - or duplicate stuff.
Reg's.