turn it on. hold down the black button for a few seconds. it will blink for the mode i9ts on. eg 1 blink, mode one. contnue to hold it and it will flash the next mode up (eg if you were on mode one, it will flash twice to indicate mode two and so on) let go when it flashes the number of the mode you want. eg if you are in mode 1 and want mode 5 hold it down until you get 5 consecutive flashes.
once it goes past mode 5, it will reset to mode 1.