Flicking through the pages in your course you'll see a wee notes icon on the bottom right of each bit of content on the page - A section of text, video, image, task etc. 

Here is where you can add to Your notes (private and only seen by you) or Discuss this which lets you add a note to share with others in your course.
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You can put any plain text into a note. In Your notes, you can add tags so you can easily search your notes later.
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All your notes for the course are collected together under the Notes section in the menu.

When you add a Discuss this note, others in your group will be able to see it.  And, if you've added a Discuss this note to a particular bit of content and someone in your group adds a note there too, you'll get a notification. 

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Notifications appear by the bell icon in the top right hand corner of iQualify.

If you're flicking through pages and see a notes icon that has a green dot next to it, that means there's already a note added. Select the icon to open up the notes already there.