how do I activate my Windows on my Mac? I have Monterey OS

To do so you would need to setup bootcamp on your mac, this is the article you can follow to do so: Install Windows 10 on your Mac with Boot Camp Assistant - Apple Support.

Although keep in mind that you need to partition your drive (Split it apart) so if you do not have that much space on your mac you may be in a position to not be able to do what your are wanting to do. If you have any questions please feel free to ask.

Windows Activation Info: https://support.microsoft.com/en-us/windows/activate-windows-c39005d4-95ee-b91e-b399-2820fda32227