opt in

US /ɑːpt ˈɪn/
UK /ɑːpt ˈɪn/
"opt in" picture
1.

optar por, aderir

to choose to be part of an activity, plan, or group

:
Customers can opt in to receive marketing emails.
Os clientes podem optar por receber e-mails de marketing.
You need to opt in to the new privacy policy.
Você precisa optar por a nova política de privacidade.