The three times thing, basically first press is like putting the key into ignition. Second press is like turning key to start the car, but not start the engine. Lastly third press with brake in is start the engine.

You step on brake and press the button first time to start the engine is like put key in and immediately start engine. Essentially, waiting a bit before starting the engine will allow the fuel pump to run for a bit.

u press once: radio only. no dash light