How do I change andmisistrator on my mac that was previously password protected but no longer have password

Can someone please assisst we are leasing a mac desktop whoever had it previously set themselves as administrator and then when they returned it they didn't take themselves off so now then company we leased it from has no idea what the password is and we can't wipe it clean and start fresh as administrators or add accounts because we are not the administrators.

Boot into Recovery mode, launch Disk Utility, and erase the startup volume. This operation will destroy all data on the volume. Quit Disk Utility and install OS X. If your Mac was upgraded from an older version of OS X, you’ll need the Apple ID and password you used to upgrade, so make a note of those before you begin.

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