Follow the below steps to install the Marco certificate on your device.
Using Safari Download the certificate below. Some browsers may give you warnings on downloading.
1. Double click the file you downloaded and add it to the login Keychain.
2. Search for the KidShield certificate in the upper right. You may have several certificates, make sure you double click the one that has “login” listed in the Keychain column.
3. Change the “When using this certificate” to “Always Trust”. Close the window and it will prompt for your computer password.
4. Highlight the Marco certificate again and it should say “This certificate is marked as trusted for this account”