How do I remove the password from my iphone 13?

If you're talking about the passcode to unlock your iPhone's screen, being aware that you can't use Face ID without a passcode and that your device's access is totally without protection, see the instructions here:--> Use a passcode with your iPhone, iPad, or iPod touch - Apple Support

Regards

Giulio

If you remove the passcode, anyone who picks up your phone will have free access to the data on your phone and your personal information.

Are you OK with that?