my printer is out of ink
You only need the data, so if you can write down without any errors the info from the screen (e.g., transaction id, amount, etc. ) then you can use that to fill out the MoneyGram slip.
Incidentally, BitInstant has a customer support thread here in the Newbie board:
Official Newbie BitInstant Support Thread (Active Customer Support) -
http://bitcointalk.org/index.php?topic=128314.0[Edit: Or snap a pic using your phone.]