1. Left click on the concept.

2. Click Add note icon from the selection above the concept (pic. 1)

Pic. 1

3. A note window will appear on the left side of your screen, where you can add a web, upload a picture / file or video URL or write your own text (Pic. 2)

Pic. 2
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4. Confirm by pressing the small arrow at the bottom.

You may add more notes for every concept. You may also delete or rename them as you like. (pic. 3)

Pic. 3