Move mouse up to start moving. The higher you move your mouse, the faster you go. Left click to jump. Skate onto ramps ( do not click ) and take off. Once in the air left click to do flips and/or move your mouse left right to spin in the air. If you can do a combo spin/flip you get extra points ( to do those move onto the next trick just before you finish the current one.
Pick up WAX power ups to gain extra speed and air time.