GREEK CHANNELS--I have ?s

New to Roku--and I am trying to figure out where the channel Guide is for all the different channels in each "group" of Greek TV Channels


How do I know what time to watch if I can't see what channels are in each group, and what is on throughout the day?


For example, on regular CABLE TV there is a visual on-screen guide for the channels you have subscribed to.

What button sequence to I press on my Roku Remote to get to this same kind of information.

Thanks so much!