How can i remove activation lock?

Did you buy this phone used? If so, only the person who it is locked to can unlock it.

If your phone is Activation Locked - How to remove Activation Lock -

How to remove Activation Lock - Apple Support

The person who previously owned the phone has to remove the activation lock from the phone. Send that person the instructions at What to do before you sell, give away, or trade in your iPhone, iPad, or iPod touch - Apple Support

He needs to do this -

What to do before you sell, give away, or trade in your iPhone, iPad, or iPod touch - Apple Support

Iv just bought a iPhone but it has activation lock on the phone I have the box and the charger how would I be able to remove this if this is possible