How do I use my comcast remote on my Sony Trinitron TV without a cable box just the cable plugged into the tv?

I have an old sony trinitron tv and a comcast tv how do i get it to work for the tv if i do not have a cable box i have the cable plugged directly into the tv so i need it to change the channels on the tv and the volume and tv/video ect.
Update: also my tv does not have a menu button how do i change the settings specifically the brightness since it is very dark
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