choose the account you want to send from.  select transfer.  Just to the right of contact name there is a green box.  Select that green box.  That will bring up a window that will have an upper slot for account name, and a lower slot for public key.  I recommend using a format like local-name to ensure you don't accidentally send to the wrong account.  After you have entered those  two boxes  hit ok.  Select the amount, enter a memo if you feel like it and click send.