This post will show you how to turn on parental control restrictions for iOS devices such as the iPod Touch and iPhone. Note that some of the screens may look slightly different from yours depending on the exact device you are using.
Step 1: Tap “Settings”
Step 2: Tap “General”
Step 3: Tap “Restrictions”
Step 4: Tap “Enable Restrictions”
Step 5: Enter your passcode to prevent tampering with the parental controls. Note, that this may also be an alphanumeric passcode. If no passcode is set, you will be prompted to create one.
Step 6: Select applications and features to disable and select ratings appropriate for the user.