I'd say to turn it off, turn the rotary switch to the right of the display. This switch allows the radio to be on but not transmitting. I.e. for setup only.. Once you've turned it off with the rotary switch, you will be able to turn on and off with the normal slide switch. you need to be able to do this to bind.
Assuming you have the Futaba FASST module and receivers, the instructions for binding are here: -
http://manuals.hobbico.com/fut/futl8...ghz-manual.pdf
I think if you are using Spektrum modules / receivers, you also have to be in PPM mode to bind and operate.
Go into menu 3 and change mod (mode) to PPM.