You need to make a backup of your phone to iTunes with the screen home button activated. When you use this backup you will see the screen home button active when it asks you to press home button, just press the screen home button and away you go. If you haven’t got a backup log someone else’s phone into your account and make a backup from that one after activating the screen home button, you can of course use your own backup to that phone activate screen home button and resave, of course making sure your mates was backed up first.