To add members:
Open the Conversation.
Open the Add Members dialog using one of the following methods:
In the Conversation membership bar, tap .
In the action bar, tap to display the view menu, then tap Members. In the action bar, tap .
Select a view from the Add Members menu:
Contacts—View a list of your contacts.
Groups—View a list of your groups.
Selected—View the people and groups you've selected to add as members.
From the list, select the people or groups you want to add to the Conversation.
Alternatively, search for a person or group to add.
Note: People outside your company have a special avatar () and their names are in purple text. If you add an outside user to a Conversation, a banner stating "Visible to outside users." appears at the top of the Conversation and any associated message dialogs. Be careful not to post any sensitive information to Conversations that include outside users.
To remove members:
Open the Conversation.
In the Conversation membership bar, tap the picture of the person you want to remove, then tap Remove from Conversation.
Alternatively, you can remove one or more people from the Members view.