To do a Pogo you...
1. Begin at a slow pace.
2. Stand on the back pegs and pull the brake so as you create a small endo.
3. Quickly pull back on the handle bars and transition your weight to the back pegs.
4. Once you get to a vertical position begin hopping the way you are leaning.
5. Ride out like an endo, and you will have done a pogo
The pogo is a great foundation trick, and as shown below adding a barspin is a great way to prep it up.