Mac
Click the "Download Certificate" button above.
Open the file which has just been downloaded.
Change the destination keychain to "System" and click "Add".
Enter the password for your Mac.
Select the "System" keychain from the left hand menu.
Right click the Certificate (it will be named FGXXXXXX).
Select "Get Info".
Expand the "Trust" tree menu.
Change the first dropdown to "Always Trust"
Close the window.
Enter the password for your Mac.
The certificate is now installed and your device will be able to use the Hillbrook WiFi properly.