When you want to watch programs that are on now with Aereo selecting the 'Guide' in the main menu gives you the option to view by Time or by Channel. Viewing by time will allow you to see what is on right now, or another time during the day, on every channel, while the by channel option will let you choose to see programs on that channel only.
Guide by Time
Guide by Channel
Once you have chosen a show from the Guide, selecting the “Watch” option allows you to record and view the desired program. While watching your recording live selecting the * button on your Roku remote will bring up a menu that offers the option to save your recorded program for later, start the program from the beginning of your recording or change your quality settings.
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Roku article quick links:
setup, the guide, your recordings, the search menu, settings menu, and two-screens mode