Removing tv sound from single track recording?

I am using Windows 10 as operating system. I have Audacity 2.1.2 and need to remove the tv sound from a single track recording to get to lower tones of individual conversations. How do I accomplish this? I am just beginning on this sound editing endeavor.
Any help would be greatly appreciating.

You can’t unbake a cake and so you can’t generally speaking remove one element from a recording once made. This is is especially so with mono recording which removes any possibility of isolating or reducing based on stereo panning.

Also if this is a surveillance recording which you want to progress as a court case we are not able to help. Use your favourite search engine for look for audio forensics specialists who will advise if they are able using special tools to make a legally admissible audio file from your recording.