i bought a iphone 6 and its icloud lock i do not have old owner id how can i unlock it please help me.

If you’re not its original owner and it’s locked to someone else’s Apple ID, you can’t. The activation lock is an anti-theft measure.

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Unfortunately, there is no way to locate the old owner.

Unfortunately, you cannot do very much with your phone unless you get assistance from the previous owner, they should either provide you with the password to unlock it or remove their account from the phone entirely remotely through iCloud.com > Find My Phone.

If you aren't able to get assistance from the owner and are unable to get a refund for your purchase, please dispose of the device responsibly by sending it for recycling.