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Hi there and welcome
You will want to reinstall the Mac which formats the disk and returns it to new.
To do this First tell me which OSX you have installed. If you do not know. click on the Apple icon in the upper left-hand corner of your desktop and then click on the "About This Mac" menu item: and the "About This Mac" dialog box will launch and tell me it.
To do the reinstall which wipes everything and returns the Mac to new, do the following
In the menu bar, choose Apple menu > Restart. Once your Mac restarts (and the gray screen appears), hold down the Command and R keys.
Select Disk Utility, then click Continue.
Select your startup disk on the left, then click the Erase tab.
Choose Mac OS Extended (Journaled) from the Format menu, enter a name, then click Erase.
Important: Erasing the disk removes all the information from the disk. Be sure to back up the information you want to keep to an external device.
After the disk is erased, choose Disk Utility > Quit Disk Utility.
Select Reinstall OS X, click Continue, then follow the onscreen instructions.
Once done, the Mac is as new and ready to give away.
If you have any problems, or would like any additional information or assistance, please do not hesitate to let me know.
Else if you can take a second to rate my service by clicking one of the stars at the top of the screen then submit, that would be greatly appreciated.
I work here, as this is more easier to convey the instructions.It sounds like you did not restart into recovery
Power it off.
Then hold Command + Option + R, and start the computer as this will boot using internet recovery
ok, can you restart the mac and try again please
No, this is the process to clear the Mac, follow it and let me know if it still gives you the issue please