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Find it in /settings → Group Links. It’s set per profile, and off by default.
This is about links you tap. To post your own, see Share links. Pasting an address yourself is Auto Buy, a separate setting.

What a tap does

With group links on, you also choose a buy amount: an amount of your own, or Card Amount (the default), the size on the card.

Should you turn it on?

Leave it off and a link opens the coin for you to pick the amount, one extra tap. Turn it on for calls where seconds matter and you already trust the source.
With group links on, a tap is a trade. Set an amount of your own, one you’d be relaxed about losing to a mis-tap. It wins over the card: a $500 buy link spends your $10. Card Amount trusts the size the poster chose, so only use it in a room you trust.