I was not at the Ross Live event, but I can point you here:
https://www.rossvideo.com/gallery/xpression-u/xpression-and-dashboard-creating-xpression-preview-client-in-dashboard/
I asked our XPression Product Manager about it, and he said the following:
I assume they are sending the users to www.rossvideo.com/dashboard to get the latest Dashboard installed before changing the IP addresses in the
Edit>Hardware Settings><Inputs / Outputs>Add> XPression Desktop Preview Client
The settings dialog box will prompt for the Host (IP Address or UNC) of the computer that will receive the Preview Output Stream

From there, in the same Hardware setup panel, the user selects the Preview & Monitor tab and assigns the desktop preview client to be the assigned preview output for the Physical channel.

Here is the Dashboard Grid File which is used in the tutorial
https://www.dropbox.com/s/1o8s4b3th3ogrd1/XPression%20Preview.grid?dl=0
#DashBoard