[Snowcake]

Have you already tried this?

To attach a file to a new post, simply click the [Manage Attachments] button at the bottom of the post composition page, and locate the file that you want to attach from your local hard drive.
After posting, the image attachments may display a thumbnail, depending on the forum settings. To view the contents of the attachment (if it is not already displayed) simply click the filename link that appears next to the attachment icon.