Within Teamwork Chat, you can add additional users to a conversation or channel after it has been created.
When you are viewing the individual conversation or channel, the details pane is located in the top right hand corner.
Below the channel name, you will see an option to Invite members. Click the invite button to select which user(s) to add in the pop up modal.
Once you have selected the user(s), click Add people to add them to the conversation.
The user(s) added will now have access to all messages within the conversation or channel
Note: Only the creator of the conversation and owner company administrators can manage the people in the conversation or channel.
For more information, see: Creating a conversation or channel