How to delete previous owners Apple ID on my device

If it is activation lock:

To remove the activation lock you can either remove it with the correct Apple id and password

Or if you are unable to do so, and you have proof of purchase, you can apply for Apple to remove the activation lock

See this guide:

How to remove Activation Lock - Apple Support

Good luck!

Hello and Welcome to Apple Support Communities!

I think this article here should help you with your problem:

https://support.apple.com/en-ca/HT208242

if there is an activation locker Find my iPad is enabled on the device then your going to have to contact the old owner

Hope this helps!