I found it. Good luck. Notice to get the last 4 functions first press the center red button, then the button indicated (keeping the Red one down).
Try this several times to be sure you have the hang of it.
It's easy! Press middle button and top button together. When it is on check that the front white LEDs are flashing on the H. It will avoid stuff then. It works brilliantly. Don't forget to turn it off before you land though!
Another tip: if you are in the UK/ Europe, I have found that when you raise gear the vid will stop. I always check the led on the cam to make sure it is flashing before I set off. I don't use the phone app whilst on the bike so I use this way to check. Hope that helps... Cheers. Chris.