Hello from the Crossroads of America
marouenca.
Page 22 of the user manual explains how to turn it on.
It's worth reading before your first flight so you know how the aircraft performs.
Here's a link to the manual.
From 15 hours of max battery life to how to use DynamicZoom, find out everything you need to know about DJI OM 4.
www.dji.com
To turn it ON, press the power button once, then again for two seconds.
Please read the manual a few times to familiarize yourself with the aircraft.
We have had read too many stories of "fly away drones" due to pilot error.
Remember to remove the gimbal protection before powering up.
Good luck and welcome to the Forum.