Send a message to a channel in Microsoft Teams
Note: Some of the instructions in this article reflect changes available as part of the public preview program and might undergo further updates before being released publicly. If your experience doesn’t line up with this article, switch to Teams public preview.
When you go to any channel in Teams, the first tab you'll see is Posts. Think of Posts as one big group conversation.
Everyone who has access to the channel can see the messages on the Posts tab.
Another key thing to know about messages in a channel is that replies to a channel message stay attached to the original message. This way, the whole thread of the conversation can be easily followed by anyone reading it. This is what's great about reading threaded conversations.
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To reply to a channel message, select the little Reply link underneath the message.
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To post a new conversation in the channel, select Start a new post at the top of the Posts tab.
Note: The Start a new post button may be inactive (grayed out) depending on channel settings. In this case, only channel moderators may create new conversations.
Replying to an existing message thread or starting a new conversation opens a compose box for you to type and format your message. Either option sends a message to everyone in a particular channel (the entire team).
When you're done composing your message, select Send 
(if it's a reply) or Post (if it's a post). Your message is now live in the channel.
Note: If you only want to talk to one person or a small group, see Start a chat in Teams.
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