Important: Zendesk removed Message for Suite customers on October 30th, 2020. We will announce a later removal date for all remaining Message customers. Where possible, please consider migrating to the Social messaging add-on. As part of the removal process, new Facebook pages can no longer be added to Message accounts.
Agents are created and managed through the Zendesk Chat dashboard, but you can navigate to agents settings page from Message. Agents in Chat have agent permissions in Message, and administrators in Chat have administrator permissions in message.