Nope. Those directions are for watching in Roku Live.
BUT... I finally discovered how to Favorite a channel within Spectrum. Everybody listening? Open Spectrum, use the top left button (left arrow) , this should open Live TV - Guide - On Demand. From there go into Guide, use left arrow in the center of the remote, this shows a new bar that lists the channel name/number, and if you press OK there, it will add a heart and favorite the channel!