How to enable ssh from local terminal

Everytime I connect to TruenasCORE through a web browser I get the message “Connecting to TrueNAS … Make sure the TrueNAS system is powered on and connected to the network.” I also tried another browser, guest mode and incognito mode. I always get that message.

I can connect the keyboard and monitor to the NAS and I can reboot it from there. What is it called that? Local terminal?

I can reboot the NAS through the local terminal and I still get that message in the browser.

What else can I do? I don’t have SSH enabled, how to enable that?

I believe it is TruenasCORE 13. I don’t recall the amount of RAM and processor type. If that is the case how to find that out from SSH?