I turn it on, press the M button twice, but it goes nuts! I have a video, but I don't have the permission to post it yet! Could you please help?

Hi, thanks for the inquiry. I would like to know if you manage to remove the phone case on your mobile phone when it's installed on the Osmo Mobile 2? Did you manage to balance your phone properly? You may refer to our video tutorial below on how you will balance the mobile device. Thank you for continued support.

You can upload the video to yt then post the link here so the Admin can help you with the issue, btw is this the first time you are using the gimbal?

BTW welcome to the forum mate!