Login as the old administrator.
Create a new account, choosing 'Computer administrator' in the wizard.
Now log-off & login with your new account details.
You should now be able to delete the old admin account from your new account. G
Hands-on: Acer Predator Triton 700 review
D&AD Awards 2017: see the best design, advertising, illustration, animation and VR of the past year
How to lose weight with an Apple Watch
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.