Start a new conversation......with the whole team
Click Teams , then pick a team and a channel.
In the box where you type your message, say what's on your mind and click Send .
...with a person or group
At the top of the app, click New chat .
In the To field, type the name of the person or people you want to chat with.
In the box where you type your message, say what's on your mind and click Send .