Open the System Preferences menu. Select Users & Groups from the drop-down menu. After unlocking it, use your administrator name and password to log in. In the list of users, choose a standard user or a managed user, then enable “Allow user to administer this computer.
In the top-right corner, click the padlock icon. Select the padlock symbol in the bottom row of icons. Enter your password. Select the admin user on the left and then choose Remove from Account from the drop-down menu. Select a username and press Delete User on the right side of this window.
Go to Start, then type in “control panel,” then click on the result. Then, log in with the Administrator account and go to Open Control Panel > Select Change Account Type from the drop-down menu > Choose a user account you’d like to alter?
Shut down your Mac, then restart it and immediately press and hold the following four keys together: Option, Command, P, and R. After approximately 20 seconds, release the keys. This erases user preferences from memory while also restoring security features that may have been changed by a virus.
Open the Users & Groups preference panel of System Preferences, unlock it, select the account you want to modify, and push the minus sign. If you’re using Fast User Switching, log out of the account you wish to delete.
