Once you create your list, you need to add contacts that will receive mailings. Contacts can be added by an iService agent, or contacts can add themselves from a list management page such as My Account > Subscriptions (above). The details of all subscribers that have joined the list are displayed on the Lists > Subscribed > Members page.
An example of the Members page is shown below. This page shows that there are three contacts subscribed to the Press Releases list, and the details of those members are displayed. This display will only show the first 1000 contacts for performance purposes. Clicking on a contact name will open the corresponding Customer Info > Contacts page with the Subscriptions tab highlighted.