How to take a screenshot if my home button is broken?
What if my home button is broken? How to take a screenshot
[Re-Titled by Moderator]
iPad (3rd gen) Wi-Fi + Cellular
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To repair the home button, you would need to get the phone repaired:
Contact Apple for support and service - Apple Support
But you can enable:
Use AssistiveTouch on your iPhone, iPad, or iPod touch - Apple Support
Please keep in mind it won't be a perfect replacement, and if you factory reset your iPhone you migth not be able to set it up.
Good luck!