How can I change password on my Mac not on my phone

You might be able to reset your Mac's password by using your Apple ID.

See Apple's instructions for macOS 10.14 or earlier (you seem to be using macOS High Sierra 10.13) in the support document Change or reset the password of a macOS user account in macOS Mojave or earlier

Scroll down to the paragraph which says Reset using your Apple ID

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