On mobile devices:
There are two ways:
- In the conversation list, tap Contacts .
- In the search field, type the profile name of the person you want to add, or tap their avatar.
- Type additional names to add more people. You can create conversations with up to 128 people.
- When you are finished creating your group, tap CREATE GROUP or Return.
Or, you can add people to an existing 1:1 conversation.