You pop your board straight up into your front hand with your back foot (do not level out like with an ollie) and grab the nose. Your front foot should stay in contact with the board at all times. As you pop your tail (your back foot should not touch the ground) you use your back foot to jump onto an object i.e. a curb or small ledge. Land on it with just your back foot while still holding your board (your front foot should still be touching the board!) and then you kind of just jump of the object and back onto your board. It's tough to get the hang of popping the board and jumping with your back foot at the same time but just keep practicing.