How to set up a router on the ZimaBoard

I have read the article at: How to Use ZimaBoard as a Wireless Router with Firewall | ZimaSpace Blog and am trying to do something similar. However I am getting lost almost at the beginning.

The article states " * Access the CasaOS management interface." in many places. How do I do that?

It is not the dashboard as the functions it refers to are not in the dashboard.

I am unable to find the management interface.

Where is it?

Thank you.
–jorge