To fix many problems on your iPad all you need to do is restart your iPad. To do this you need to: 1. Hold down the power button (do not tap the power button that will put the screen on sleep mode) 2. A prompt will pop up asking to slide to turn off. Follow the instructions and your iPad will start to turn off
If your iPad is frozen it will require a hard reboot. To do this hold the power and home button at the same time.