Step by Step to Use My Domain on Firebase (Google Hosting)?

Hi everyone!
I have a technical question and would really appreciate your help.
I’m developing a system that is hosted on Firebase (Google) and I already have the Firebase project link.
What I need is to point this Firebase link to my own custom domain, so users can access it through my domain instead of the default Firebase address.
Does anyone know if there’s an official step-by-step guide or a reliable tutorial explaining how to set this up (DNS, Hosting, etc.)?
Any documentation or practical tips would be greatly appreciated.
Thanks in advance!

This is the guide that I used to connect my domain to my Firebase app hosting - Connect a custom domain  |  Firebase App Hosting - if you need any help, feel free to message me.