How to configure gitlab page behind ssl nginx reverse proxy

I have followed the tutorial and forked a project that has been built and deployed.

The job has created a page.

My Gitlab is hosted at https://mygitlab.domain.com

The page is deployed at http://myproject.myuser.domain.com.

The port 80 is not accessible from the outside, how am I supposed to access/configure to access the service?

How is the service supposed to be accessed?