hello i have a problem with my iphone.i have another one and i know pascode displey,but write on iphone is disabled?what i do?

Then you need to have the phone fixed. Schedule an appointment at your Apple Store Genius Bar. Personally, I wouldn't invest anything in an iPhone as old as a 7. But that's up to you.

The password isn't of much value if the screen isn't functional. You're asking us to help you, which we can't do when the phones display is not functioning. Schedule an appointment at your Apple Store for either service on your iPhone 7 (something I wouldn't spend any money on) or to buy a new iPhone (a smarter investment at this point).