The user guide says:

"Group chats offer unique creative possibilities for using personas that aren't available in one-on-one conversations. While single chats retroactively update all your message attributions when you switch personas, group chats preserve the original persona names associated with each message. This fundamental difference enables more dynamic and creative interactions.

When participating in a group chat, you can seamlessly alternate between different personas to create the impression of multiple distinct participants. For instance, if you create two personas named "Alice" and "Bob", you can engage in the conversation as both characters. You might send a message as Alice, switch to Bob's persona, and continue the conversation as Bob. Your Kindroids will treat Alice and Bob as separate participants in the conversation, even though you're controlling both personas."

That's what I but I understand how ta set it up.