Come up the same way as for a nose stall but in Nollie position. Your pop should be quite far away from the ledge (depends how high it is). In the air try to keep your weight over top of the nose and then you will land on a nose stall. Takes quite a bit of practice but after a bit of practice its nothing. Just spend about a week on this and you should be pretty good at it.
Good Luck!
By: Tom-E