How to unlock Activation lock

See:

How to remove Activation Lock - Apple Support

Sonu_luhar wrote:

Yes

There is only one way to unlock Apple’s theft deterrent feature: enter the Apple ID and password that were used to enable it. There is no other way, unless you purchased the phone new directly from Apple or an Apple authorized reseller; in that case see→Start an Activation Lock Support Request. But don’t waste your time unless you are the original owner, and not someone who purchased a used iPhone.

There is only one way to unlock Apple’s theft deterrent feature: enter the Apple ID and password that were used to enable it. There is no other way, unless you purchased the phone new directly from Apple or an Apple authorized reseller; in that case see→Start an Activation Lock Support Request. But don’t waste your time unless you are the original owner, and not someone who purchased a used iPhone.

There is only one way to unlock Apple’s theft deterrent feature: enter the Apple ID and password that were used to enable it. There is no other way, unless you purchased the phone new directly from Apple or an Apple authorized reseller; in that case see→Start an Activation Lock Support Request. But don’t waste your time unless you are the original owner, and not someone who purchased a used iPhone.

I want to remove activation id so that I can create mine

Yes