Changing AMPWEBADRESS in GUI

Where in the version 13 GUI do you set the AMPWEBADDRESS variable for /etc/amportal.conf?

The file of course is headed by “Do NOT edit this file as it is auto-generated by FreePBX.” so I assume there is a place to set it in the GUI

it is in the advanced settings

I see it under the System Setup section, FreePBX Web Address. Thanks.