How to password protect the WiFi Hotspots created by the LibreRouter network?

We are using one LibreRouter for wifi in a home. It will not be part of a mesh network. We want to put a password on the WiFi. What options will work?

  • LibreRouterOS
    • ssh thisnode.info, then use uci commands to set the wifi password
    • build LibreRouterOS firmware with a config file that sets wifi password
    • none of these?

I see the post Can I put my own firmware on it? – that post explains some details about OpenWrt on the LibreRouter. I have moved some parts of my post to that thread.