Are you ever going to respond?

I followed your documentation exactly for adding custom scripts and it does not work. I get this error in the console. I copied your exact codes and tried creating the custom-firebase.js file in both my theme and my child-theme. It does not work in either. I tried adding the function to both theme and child-theme as well.

Failed to load resource: the server responded with a status of 404 (Not Found)

Please, how do I add custom scripts?

The page I need help with: [log in to see the link]