What do i do if my iPhone 5c is not allowing me to connect it to iTunes becuse the password is not working

I recently got my iPhone 5c repaired and when I recieved the phone back the password wouldn't go through. So I kept trying until the phone notified me that I had to connect it to iTunes. When connected to iTunes I got pop ups that explained how the phone couldn't be connected to iTunes until it was unlocked. I have no idea what to do because every video I watched on how to restart the phone was not useful to me because my home button is not working. I am supposed to take the phone backk to the repairer on Friday but i will need to use it before then. Any ideas please help me.