The heelflip is sort of like the kickflip.
1.Place your feet in the same place as a kickflip, but let your toes(front
foot)hang off the toe edge of the board
2.Snag the tail down(with your back foot)and at the same time slide
your front foot towards the toe edge of the board.
3.Right away bring your front foot back over the board.When you see
the griptape put your feet down.
4.Bend your knees to absorb the shock, land and ride away.