If you are running version 7.4 or above of the UniFi Network Controller that uses the hotspot manager, the Guest control option is no longer available. Instead, follow these steps to set up guest control:

Click the Hotspot Manager icon:

Choose “Landing Page”:

Under Authentication choose External Portal Server click “Edit” and change the IP address to 144.76.195.139:

Under “Settings” Ensure you have the following:

Your settings will have saved automatically.