Why cant i delete this account?

[Android Central Question]

My sister gave me her old phone and it wont let me remove her account nor will it let me add an account. Can you help me?

 

[Tim1954]

She has to sign out of her accounts using her credentials before you can use the device effectively, as it's associated with her accounts.

 

[Dano1200r]

And if she wanted, she could see everything you are doing