How to Make a New Post
To start a new conversation (as opposed to replying to an existing one) you can tap either the Composer + button or the New Conversation text field shown below. Tapping either of these will create a new thread that will notify everyone in your Cocoon. If you want to reply to an existing thread, you should tap directly on that thread (more about this here).
When you tap on the Composer + button, you'll be taken to the multiformat composer where you can post photos, videos, your location, your mood and even your upcoming flights.