To start, click on any disk and move it to one of the other posts. The catch is that you may move only one disk at a time, and you may never place a larger disk on top of a smaller one. Keep moving the disks around the three posts until you have a completed tower.
To save your sanity, start with a small number of disks. The minimum number of possible moves increases geometrically as the number of disks increases. Whereas it's possible to solve the 3 disk game in just 7 moves, the eight disk game requires at least 255 moves!