Which product did you decide to install? If you’ve followed the instructions in the article (so setting CommandStartRDP “rdesktop -f”, editing the AvailableSessionTypes key in the node.cfg and server.cfg), it should be out of the box, and when you see ‘Create a new virtual desktop’ in the GUI, an icon for RDP will also be there. See fig. 6 here https://www.nomachine.com/creating-new-virtual-desktop-sessions to see what I mean.
