@Evzen-Pomschar Should be as simple as following the ubuntu guide here, however I have an hour spare, so I will make sure and edit this post with a definitive answer shortly.
EDIT: Seems you can't deploy to a live environment without a paid plan, so I can only test it so far, but it comes with nodejs already installed, so assuming you have a paid plan, and access to the command line, following the ubuntu install above should work fine. (Changing the first line to just
sudo apt-get install redis-server imagemagick npm)
If you're looking for a free IDE to test NodeBB, I'd recommend Koding.com, works the same was as codio.
May as well make a quick guide to deploying on Koding while I've got some time spare.