Installed Drupal 8.8.4 on Google Cloud through Kubernetes engine. What further steps do I need to take?

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Cluster information:

Kubernetes version:
Cloud being used: Google Cloud Platform
Installation method: Click to deploy
Host OS:
CNI and version:
CRI and version:

Installed Drupal 8.8.4 on Google Cloud through Kubernetes engine. What further steps do I need to take?

I need to upload some files to this fresh Drupal installation. I need to modify some files such as settings.php. However I am unable to reach the installed files of Drupal.

I have made my some websites through cpanel that was easy. Now I am facing some difficulties, but I am a keen to find out. I am not a techie.