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I am replacing an iPhone 7 screen and have not done one of those yet. There is another cord on the side of the phone that I did not see which is the home button. I didn’t see if. And I broke it. Do u know where to find that piece?
If it’s the cable that directly comes and is connected to the home button itself then you can’t just replace it as it will not function at all. Apple is the only way at the moment to get the home button to work again (They will probably charge you a screen replacement).
If you broke any part of the home button, you must take it to Apple in order for you to have Touch ID and physical home button functionality back. The home button is “married” to the logic board, therefore there is no way to replace the button and expect to have any functionality.