iphone 6s

To clear an Activation Lock, you will need the password of the associated Apple ID, or the original purchase receipt and matching photo ID and a discussion with Apple Support. If this device was recently purchased and the seller is still available, contact the seller for remediation or for refund. A remote unlock using iCloud is available to the person with the Apple ID holding an Activation Lock, if they’re inclined to unlock this device.

If you forgot your Apple ID password - Apple Support

If you forgot your Apple ID - Apple Support

How to use account recovery when you can’t reset your Apple ID password - Apple Support

How to request access to a deceased family member's Apple accounts - Apple Support

Contact Apple for help with Apple ID account security - Apple Support

Activation Lock is a theft deterrent mechanism. A theft deterrent that is easy to bypass would not be much of a deterrent. No, nobody here in the Apple discussion forums can help you clear Activation Lock. Only someone with the Apple ID and password holding the lock, or Apple, can clear this lock. For Apple to clear the lock, you will have to provide a receipt with proof of original purchase and with matching serial number, and provide matching personal identification, or similar materials.

And as purchasing devices with Activation Lock is far too common, also see the following:

The All Too Common SAD Reality of Buying a Used iPad/iPhone

Settings, your name

There is the AppleiD!

then if you forgot your appleID password

https://iforgot.apple.com/password/verify/appleid

I don't believe you can forget the Apple ID.

Where did you buy this used device?

If you forgot your iCloud. I think that your phone cannot using anymore. Or you have to bypass your phone.

“...Or you have to bypass your phone. ..”

what does that mean? Recycle?