Erasing a user account from your Mac

Boot from the account you wish to save. If it is an Admin account then open Users & Groups preferences panel. Click on the Lock icon and enter your Admin password when prompted. On the left, you have a list of user accounts. Select the account you want to remove then click on the Delete [-] button at the bottom of the list. You will be offered four options. Choose the option that specifies an immediate removal. I believe that is Option 3. Do Not select the option involving a Secure Erase unless you want to wait for days until it finishes.

In Users & Groups is a list of users on the left. Looks somewhat like this:

Select a user to delete. In this example, I have chosen the Testing user.

Next, I will remove Testing by clicking on the Delete [-] button. When I do a panel drops down.

I have opted for the last option to Delete the home folder. When I click on the Delete User button that user account is removed.

The first user can create new users ( can be admin or standard account ) .

In the example , the original account name is kept as " first " and the admin created a new admin account named as " hjuy " by clicking on plus sign selected passwords and finally created .

Go to apple logo and sign out from account named as " first " when desktop screen appears enter admin name as " hjuy " and enter the new password for it , if you want to keep this as administrator , select " first " and click on minus sign check the box of home folder and click on minus sign it will be deleted also select group folder and click on minus to get it deleted permanently .

Note : When there is a single admin account by default allow user to administer this account is faded ( the box still is checked ) , you can see the lock is opened .

Hello !

The minus button is faded in your computer you are having an admin account and what other accounts did you created without a screen shot of your users and groups it is not easy to calculate , is this refurbished machine or did you purchased from apple authorised centre I think you have to first consult apple support or have to plan for clean installation .