how do you change password on macbook

Change or reset the password of a macOS user account - Apple Support

vicky_vadgama wrote:

power buton + command button + R at same time

On Apple Silicon Macs: Only the power button needs to be held down, until Startup Options appears.

On Intel-based Macs: Only Command-R needs to be held down, until the Apple logo and a progress bar appear, or until a spinning globe appears.

power buton + command button + R at same time, select terminal from settings, and open terminal window and type "resetpassword" and set a new password.