the 1985 v 65 magna all you have to do is turn the helmet lock key to open and lift the seat off, it goes back on the same way then lock the helmet lock to hold the seat.
if you look on theleft hand side of the bike by the end of the seat is a key hole this is the helmet lock, use you ignition key and open the helmet lock. after the lock falls down you will see a small lever inside, pull the lever towards you and the seat lifts off.