Soft resets are usually conducted in an attempt to fix malfunctioning applications or because they're required for software installation. Soft reset contrasts with hard reset, which removes all user data, settings and applications and returns a device to the same state it was in when it shipped from the factory.
1. Hold down your power button.
2. Wait untill this menu shows up, and release the pwoer button.
3. Now press Restart or Reboot option on the screen.
4. This is it, your phone will now restart.