Where is you router? Seems to me you can just run a line from the router to where you want the computer
I have fios cable for tv and phone downstairs, but wireless for internet upstairs. What materials do I need to hook up my computor in the same room as my tv? I'm elderly, so make it simple, please.
I assume what you are saying is that you have Set top box and phone connection downstairs. And your router for Internet upstairs.
Do you know if your computer has a wireless adapter built in?
Some newer computers do.
There are several different options depending on what your wiring options are.
Might be best to ask a family member or friend to help you out as trying to provide details about these options without being there can be difficult.
Not an age thing, but an expertise thing.