After you've installed Soft Serve, you can `ssh your-user@mash.example.com -p 2222` with the SSH key defined in `soft_serve_initial_admin_key` to see its [TUI](https://en.wikipedia.org/wiki/Text-based_user_interface) and follow the instructions to configure Soft Serve further.
Note that you have to [finish the configuration yourself](https://github.com/charmbracelet/soft-serve#configuration), otherwise any user with `soft_serve_initial_admin_key` will work as an admin.