What was the full address you put in your browser?
I’ve run “node webui.js” un /usr/games/minecraft after updating the webui, but to no avail.
Did you get an error? Because if you started the webui like that (which is not the way that that is prescribed: the wiki details this), then the webui is in the foreground. That also means that if you’re able to type anything in the console (SSH/terminal), then you’ve already closed the webui.
Starting it up like shown in the wiki makes it run in the background. This is actually the default, and the Turnkey installation should already allow your webui to open automatically, without having to start it up with this command.
Can you provide the contents of your MineOS log?