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The TV is the screen everyone in the room already looks at. Readout shows the captions there in big type, while you keep captioning from your phone, tablet or computer. There are three ways to get them there. Start with the first; the others take over the switching for you.
Works on most smart TVs with a web browser, including LG TVs from 2016 and Samsung TVs from 2017.
1

Open the TV page

In the TV’s web browser, go to readout.tv/tv. It shows a code and a QR code.
2

Pair it from the app

In the app, tap TVs and phones at the top, and type the code the TV shows. Or scan the QR code with the phone you caption on, and confirm.
3

Caption

From now on, the TV joins by itself whenever the app is open. Between conversations it shows Ready for captions instead of a code.
On an LG TV, Quick Access puts the captions one button away: with the captions page open, press and hold a number key on the remote and assign the browser to it. Holding that key then opens the captions, and Back returns to what you were watching.

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A TV is the whole household’s

A paired TV belongs to your account, not only to the phone that paired it. Everyone signed in to the account sees it in TVs and phones, and can rename it or forget it. The TV shows one device’s captions at a time. To show yours instead, tap Show here beside the TV; it says who has it now.

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Text size on the TV

Menu → Display sets how the captions look, on the TV too. The TV’s text size has buttons of its own, Bigger text on TVs and Smaller text on TVs, so the TV can be big while your phone stays readable.

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Pairing it with someone else

A paired TV shows no code, so nobody who can see the screen can take it over. To pair it with another account, forget it in TVs and phones and it shows a code again. Or, on the TV’s Ready for captions screen, choose Pair with a different device with the TV’s remote.
A TV whose browser is too old says so where the code would be. Use screen mirroring, or a streaming stick or a Raspberry Pi on one of the TV’s inputs, instead.