Support can't give any help rather than "google for how to double spend ..."
I think what they meant by this was to go ahead and send out a transaction identical to the first one but with the proper fees this time. Once the second transaction, the one with proper fees, is accepted the first transaction will get dropped as the double spend.I tried using blockchain.info from web access, but if i insert the transaction once again it says insufficient funds and i can't proceed that way.