iPhone 6 activation lock help

Enter the correct Apple ID and Apple ID Password used to set up the device. If you aren't the person who originally owned the device, you cannot remove Activation Lock.

The link at the top of this page, which brought you here is the right link to help you.

If you bought a used iPhone, don't know the Apple ID or Password, nor can you reach the original owner of the phone, it is a useless brick which Apple, nor anyone here can help you get into.

If you bought a used device read this --> The All Too Common SAD Reality of Buying … - Apple Community

Enter the correct Apple ID and Apple ID Password used to set up the device. If you aren't the person who originally owned the device, you cannot remove Activation Lock.