how to reset my macbook air admin using password keychain

Just go ahead and it will let you create a new Administrator account. Don't worry, all of your pre-existing data is still available.

Your Mac will restart and you need to go through the entire setup process as if it was a brand new Mac.When it stops, enter the following commands one by one. Your Mac will display the scrolling white text during bootup. When you hear the startup chime, hold down the Command and S keys simultaneously to enter into single-user mode. This allows forgetful users to create a new admin account when they're locked out of Mac due to forgetting password. Single-user mode under Mac OS X gives you all root privileges without root password. Method 1: Reset Forgotten MacOS Mojave Password in Single-User Mode No need to use Mac installer disc or third-party software. Just boot your Mac into single-user mode or recovery mode, you can either create a new admin account or reset lost password of any existing account. Mac doesn't make password recovery as difficult as Windows does. Forgot your Mac's login password? How do I reset lost admin password without Mac OS X installer disc? If you can't sign in to another Admin account, here are several approaches you can take for resetting your forgotten MacOS Mojave password, without reinstalling.

How to reset my macbook air admin using password keychain