Reset iPhone 5C:
- Press and hold the Home button (big circle below the screen) and the Sleep/Wake button (on top of the iPhone) simultaneously.
- Continue holding both buttons until the iPhone shuts off and begins to restart. This will take anywhere from 15-60 seconds.
- You may let go when you see the silver Apple logo. You have now completed the hard reset successfully.
- Now wait for load from the Apple logo to the main screen.
Go to Settings > General > Reset and select "Erase All Content and Settings"