the BOOSTER controler (4 channel) has a button... on the upper right hand side (corner). if you ever played playstation or Super nintendo. it is where the R(R1) button is. All you do is hit that to go to booster mode ten release to go back to normal mode.

Setting A - ALWAYS on regular mode
Setting B - Booster option is open
Setting C - Booster is ALWAYS on

have fun... ps if your thinking about buying a booster set or not... buy it, its more fun also faster then stock.