Restart and enter Recovery mode (for 10.
Select the old account, press the Reset Password. After logging in to the new account, go to the Users & Groups preference pane. You can leave all fields in the personal information step blank. 
Go through the steps of creating a new account. passwd /Users/username (without a trailing slash) and enter a new password. launchctl load /System/Library/LaunchDaemons/ (or /System/Library/LaunchDaemons/ in 10.6). This account has all the privileges and access to the ADSelfService Plus admin console. There are many ways to reset the login password without installation media, here are three: Change the password in single user mode ADSelfService Plus is shipped with a default admin account. AppleSetupDone file from: /Volumes/Macintosh\ HD\ -\ Data/private/var/db Instead of single user mode, boot to recovery and use the Terminal Utility. 
Now - follow the official Apple triage steps: With macOS Catalina and many recent macOS - the built in tools guide everyone how to reset admin permissions without needing any of the single user mode boot tricks of old (left at the bottom for posterity and people running OS that were shipped before 2015)
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