How do you connect speakers directly to a TV?

Answer 1

Some of the better TVs have external speaker connectors on the back, most do not. If the TV has audio output connectors you can connect a stereo audio amplifier and speakers to these. If this works, go into the audio menu and turn off the TVs internal speakers.

Answer 2

First off, you don't "hook up" wireless speakers to anything - that's why they're wireless!

I think you mean can you just buy a set of wireless speakers, turn them on, and hear sound from your TV come over these speakers?

No. You need something between the TV and the speakers that changes the sound signal to a wireless radio signal. Usually this would be something like a "home theatre" system that is paired (uses common frequencies) with the wireless speakers.