Q: How do I find the previous person from my iPad that is locked

Unfortunately, that is up to you to find the previous owner. We cannot help you with that.

If you are trying to accomplish something else, we would need more information.

You cannot.

It requires the Apple ID and password of the previous owner. If you don't have it and cannot get it, then the device is useless to you. Return it for a refund if you can.

Find My iPhone Activation Lock

In the future check first before buying second hand: How to check for Activation Lock before buying a used iPhone.