LED or LCD?
Anyway, if its LCD, here:
On the LCD you hold the bottom button to turn on(its on the handle)and the top one you press to choose whice firing modes you want just press it once to change,you have a choice of Semi-auto,multi,turbo,FULLY AUTO, and so there is a number beside those words and you have change how many balls per seccnd the gun shoots with different modes.

I hope that helps...