How to Add additional connections using coax cable

[AquaDanceS20]

I've had Telus Fiber installed into an 1990's Townhouse.  The Telus install asked me what coax point I wanted the modem connected to.  I decided on a spare bedroom/office.  The TV is one floor below it and doesn't maintain connection to the wifi very well.  How can I use the Coax Cable connection behind the TV to connect a second inthernet connection?

[TELUS_Support]

Hey @AquaDanceS20.

In-home Networking is tricky without being there, but, if you have ethernet ports that are terminated you could plug the modem into the wall and go into the other room and install a booster for example