Just connect the unit to 12 volt supply (yellow cable) and earth (black), the ignition switch cable to red cable. You can get cable connectors that you can connect the power with out cutting the wiring loom of the F500BT.
When I start the car the power supply starts up and the F500BT starts, you can turn the engine off and as long as you don't take the key out you can re-start the car without re booting the unit.
When you take the key out of the ignition the unit will stay powered up for 1 minute, I simply press the power button to turn it off.