On your mac desktop, choose Apple menu in top corner and system preferences.
Controls & Settings guide
Mavericks Parental control allows your kids to have a safe and happy experience on the Mac. Using Parental Controls preferences, you can manage, monitor, and control the time your kids spend on the Mac, the websites they visit, and the people they chat with.
To have Mavericks installed on your mac computer. Password for all users.
See more resources and articles to help children stay safe online.