The next step for enabling parental controls on the iPad is to turn on the iPad restrictions. Simply touch the top of the screen where it reads Enable Restrictions.
You will be prompted for a four digit passcode. Choose something you will remember, but not something your child can guess like a birthday or the last digits of a driver's license. If there is a significant date your like to remember in your past besides birthdays and anniversaries, that would be perfect.
The passcode for the iPad's restrictions will need to be entered twice to make sure you don't accidentally tap a different number than intended.