I have an old Iphone 7 that is disabled but I cannot unlock it. How do I do this?

Start here: https://support.apple.com/en-us/HT204306

Sdavis69 wrote:

I had to change the screen when it broke

Was the screen change done at an Apple Store or Authorized Apple Service Center?

• Yes. Return there and seek assistance.
• No. You had an unauthorized repair performed on your iPhone. Apple will no longer be able to assist you with your iPhone.