Lighttp Pi hole for GUI address

i need change Gui addressf or my hole. I've found an aricle abput lighttp on this forum.
The problem is that i'm a newbie. Can you help? Thanks in advance...

Can you explain further what you are trying to accomplish?

i want to install Openvaultmedia without unistalling Pihole and Openvault isn't compatible with portainer

i mean something like that: Ability to change the GUI port - #4 by Coro
i'm a newbie. Can you help me?