naming a new cable box

I had to replace a cable box today along w/them fixing my On-Demand issue.  I need to name(rename) the box as it is in the bedroom and they are both now black as opposed to one silver and one black (yes it was getting ready to be bricked it was that old)  So my question is does any one know how to rename it since when I search the knowledge base there are the same question from 2014/2015 BUT when I try to open them it does not open it and just falls back to the 'home' page for this area.    Please help as I don't remember how to do it and can't find a spot to do it.  Thanks