の代わりに

The phrase の代わりに is used after a noun to express "instead of" or "in place of" and show that that noun is being replaced by something else. That "something else" is generally listed later in the sentence. If the context is clear, the noun + の part before 代わりに can be dropped.

今お姉さんはクラブがいるから、代わりに私が晩ご飯を作るんだ。
My big sister is at her club right now, so I'm cooking dinner instead.

ペンの代わりに鉛筆を使って書いてください。
Please use a pencil to write instead of a pen.

レストランで魚の代わりにラーメンを食べると思う。
At the restaurant I think I'll have ramen instead of fish.

最近、日本でも現金の代わりにカードを使う人が多くなった。
Recently, even in Japan there are many people who use cards instead of cash.