The admin of the Channel can add members and for Channels that are associated with a Group, members get automatically added to the Channel once they are part of the group.
However, the admin can manually add members outside of the group to a Channel.
To add members to a channel:
- Click the gear icon in the top-right corner of your Channel.
- Under the Members section, enter their names in the search and click Add to Channel, seen next to their name.