Multi-user account creation and management behind No-IP and Tailscale

Hi everyone!

I would love to use Dawarich to track my family's mobile phones. My setup involves:

A homelab running a Docker container

Tailscale for networking

A fixed DNS configured via No-IP (no-ip.org) for my server

However, I'm stuck: I can't figure out how to properly create accounts and add them as additional accounts within my homelab setup.

Is there something obvious I am missing here? Any guidance or a quick workflow on how to achieve this multi-user setup would be greatly appreciated!