Messaging Lists - Adding Subscribers
One of the most important aspects of a Messaging List is ensuring that your messages reach as many people who want them as possible, without "spamming" people who don't want to receive them. The owners/admins of the List can add Subscribers in a couple of different ways.
Adding Multiple Subscribers
Most of the time, the "Audience" panel is the easiest way to add new subscribers. It finds the "potential subscribers" - people who (a) have an email address or mobile phone number and (b) haven't opted in or out of the List yet. Click the "Add subscribers" button to see the list.
The Add Subscribers page allows you to add the "potential subscribers" one-by-one or all at once. Click the "+" icon to add a new subscriber. Or click the "Add all" button to add all of them.
Adding a Single Subscriber
You can also use the "List" tab on the Person page to see the Messaging Lists available to the person. Click the "add" link to subscribe the person.