Roku Remote

I am not sure if Xfinity updated the streaming guide. Now when I use my Roku remote, I cannot add a channel to my favorites. When I highlight the channel and press ok, I don’t see make favorite. I see series info recording options and three dots. I am assuming there has to be information where the 3 dots are but with my Roku remote, it does not allow me to use right arrow to click on the dots. How to I access or can the the three dots be accessed using a Roku remote? I do not have an Xfinity remote. My TV is Sony. I am streaming through Roku. Xfinity has not made available the app on Sony TVs.