Suppose that you let your child use your iPad, but you want to put certain restrictions on it.
1. Go to “Settings -> General -> Restrictions” and tap “Enable Restrictions”
2. It will prompt you to set an arbitrary four digit passcode. Then it will re-prompt you to confirm that passcode. This is so that your child cannot go into the settings and re-enable your restrictions without knowing the passcode.
3. Now you can disable certain apps of your choosing. For example in the below, we have disabled Facetime and Ping, while allowing use of Safari for surfing the web, YouTube for watching videos. We also allow the use of Camera and iTunes.
The icons for the respective disabled apps will no longer show up on the Home screen. This means that even you cannot access them. However after your child is done using the iPad, you can re-enable them by tapping on “Disable Restrictions” (shown above). But you will need to know the password that was set previously.