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Link to Article: https://support.microsoft.com/en-us/office/create-and-format-a-post-e66777da-636b-49eb-9408-b0d88b212885
Create and format a post or announcement to start a conversation in a channel.
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Select the New conversation button.
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Type a message.
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Select Format .
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To create an announcement, select a post type > Announcement .
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Type a headline and an optional subhead, and then add a color scheme or your own background image.
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Format your post including the following options:
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Select Send .
Tip: To make changes to a post or announcement, select More options > Edit .