Create the destination folder first.
to get a hint on the path goto:
Control Panel » DB, Paths & URLs
Look at what you have for:
Absolute PATH to Main Directory:
modify that path to where you want to upload them to.
And place that in the
Attachment Storage Directory:
Don't forget to click on the test link.
Then add your url to the folder in:
Full URL to Attachment Storage Directory:
Depending on where your attachments are to be
should be likehttp://propetphotoforum.com/attachments
Or submit a support ticket like Brooks posted.