macOS Reset Computer Login Password

If you forgot the password to log in to your Mac user account, choose a reset option from the login window.

Before you begin

Make sure that your Mac is connected to the internet and using macOS Catalina or later. If using an earlier macOS, please reach out to UIS helpdesk for assistance with an upgrade.

Choose a reset option from the login window

To see one of the following password-reset options, click the question mark next to the password field in the login window. If you don't see a question mark, enter any password three times.

If you see the option to reset using your Apple ID:

Click the option to reset using your Apple ID, then proceed as follows:

If your Mac restarts, skip to the next section, “If you see the option to restart and show password options.”
If your Mac doesn't restart, but immediately asks for your Apple ID credentials, enter that information and click Reset Password.
If you're asked to create a new keychain to store the user's passwords, click OK to restart your Mac.
If you're asked to select an admin user you know the password for, click “Forgot all passwords?”.
If you see a Reset Password window with the option to Deactivate Mac, click Deactivate Mac, then click Deactivate to confirm.
Enter your new password information, then click Next.
If this window shows multiple user accounts, click the Set Password button next to each account name, then enter the new password information for each account.
When the password reset is completed, click Restart.

If you see the option to restart and show password options

Click the option to restart and show password reset options, then wait for your Mac to restart.
You're then asked to take one of these steps:
Sign in with your Apple ID. You might also be asked to enter the verification code sent to your other devices.
Enter your FileVault recovery key. You received it when you turned on FileVault and chose to create a recovery key instead of allowing your iCloud account (Apple ID) to unlock your disk.
Select a user that you want to reset the password for, then click Next.
Enter your new password information, then click Next.
When the password reset is completed, click Restart.

If you see the option to reset using your recovery key

All Georgetown university Apple computers should have FileVault enabled, the filevault recovery key can used to recover access to an account in the event a password is lost.
The recovery key can be accessed at https://casper.georgetown.edu:8443, searching for the computer serial number, and selecting disk encryption and clicking on "show key" in the personal recovery key" field:

Click the option to reset using your recovery key, then enter your FileVault recovery key.
Enter your new password information, then click Reset Password.

Source: https://support.apple.com/en-us/HT202860