Before you start
Things you need to know:
Before you change an email opt-in type, you must read about and fully understand the different opt-in types available. In many cases, you can't change the email opt-in type of a contact without their recorded consent.
You must not change a contact's email opt-in type to Double without recorded consent.
If you change the email opt-in type to Verified double for contacts already in your lists, we send them a confirmation email and temporarily remove them from all of your lists until they manually confirm their opt-in status.
Change a contact's email opt-in type
Go to Audience > Contacts.
Find the contact you want to change the opt-in type for, then select the contact’s email address or the Edit icon.
Select the Data fields tab.
For Email, select Subscribed.
In the side panel, select the current email opt-in type, then select the radio button for the email opt-in type you want to change to.