I am unable to complete the installation of macOS Monterey because I can't remember my administrator password

Reset Computer Password 

Intel Computer

1 - Restart computer and immediately hold Command + r keys

2 - Top Tool Bar >> Utilities >> Terminal

3 - Type resetpassword as one word and no spaces

4 - Press Return key

5 - Follow the prompts and remember the New Password

Apple Silicon M1 Computer 

1 - Choose Apple menu > > Shut Down.

2 - Press and hold the power button on your Mac until you see “Loading startup options.”

3 - Click Options, then click Continue. 

4 - Top Tool Bar >> Utilities >> Terminal

5 - Type resetpassword as one word and no spaces

6 - Press Return key

7 - Follow the prompts and remember the New Password

Hi TonydeLucia,

Welcome to Apple Support Communities. We understand that you are trying to upgrade your macOS but do not remember the admin password.

The administrator password is the one that you use to log in to your Mac at the login screen. If you don't remember it, use the guidance from If you forgot your Mac login password.

Take care.