opt in

British  

verb

1. (intr, adverb) to choose to be involved in or part of a scheme, etc

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Example Sentences

Precise location sharing hasn't yet been enabled in the US, where it is expected to be optional and turned off by default so users will be asked to opt in with a pop-up message.

From BBC

Stores and other places open to the public are a no-go unless they explicitly opt in.

From The Wall Street Journal

Those who have already left the military will not be affected unless they opt in.

From Barron's

I do this because it forces me to opt in to the subscription every month or year—and makes sure I’m actually using it.

From The Wall Street Journal

Warner Music subsequently signed a partnership with the company, which will allow users to create AI-generated songs using the voices, names and likenesses of the Warner acts who opt in to the service.

From BBC