Starting private chats:

1. Click Chat in the left sidebar
2. Select New chat  at the top
3. Type recipient name(s) in the To: field
4. Compose message and press Enter

Starting channel conversations:

1. Select team and channel
2. Click Start a post at the bottom
3. Type your message and click Send

For group chats:

• Add multiple names in the To: field
• Or click Add people in an existing chat

Tips:

• Use Format button for text formatting options
• Use Files tab to share documents

For more details, see Microsoft's guide: Chat in Microsoft Teams