Activation locked

My iPhone 6 goes on activation locked. I don’t have any access to whose inter his own Apple ID and his own password when he reset and settings up my iPhone beacuse on that time I wanted to give my phone to one of my friends and I wanted to rest for. But that person changed her mind. From then on my phone is with me and now I want to use it. I would be grateful if you could help me with this.

sin yours