opt in

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

aderire, optare per

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

:
Customers can opt in to receive marketing emails.
I clienti possono aderire per ricevere email di marketing.
You need to opt in to the new privacy policy.
Devi accettare la nuova politica sulla privacy.