https://zulip.com/help/subscribe-users-to-a-channel
Subscribe users to a channel | Zulip help center
Organization administrators can configure who can subscribe other users to channels. Channel administrators can configure who can subscribe anyone to a...
channel zulip helpsubscribe
https://zulip.com/help/guest-users
Guest users | Zulip help center
You can add users who should have restricted access to your organization as guests. For example, this may be a good choice for contractors or customers invited...
users zulip helpguestcenter
https://zulip.com/help/invite-new-users
Invite new users | Zulip help center
You can invite users to join your organization by sending out email invitations, or creating reusable invitation links to share.
users zulip helpinvitenew