Linkspun.com

Hi!
I want accept a trade request but i have a problem after i click "View Trade".
I see this at link form on the bottom of the page.
"Linked From:
None chosen yet.
The page(s) you want the link to come from."

And got this error message:
"Please select at least one page to request a link back from."

I don't see any option where i can choose "linked from:". There is nothing clickable.
Should i select "linked from" somewhere else, but where?

Thank you for your help!

There should be a list of sites of the other guy, with a "Add to request" button at the right hand side of each, just click that button to request a link from that site (or more than one).

If there's no such list then the other guy may have limited PR and not realised that it has left you with no sites to choose from. Best to send a comment in the comment box in that case, or just deny the trade.