Constellation Web
Click on the note. An inline menu including a delete button will pop up. Select the delete button. You will be asked to verify if you want to delete the note. Once you verify the deletion, the note will be gone forever.
Constellation Application
Tap a previously created note. The keyboard will pop up. To delete the note, press the delete button on the keyboard. To verify the deletion, slide the delete key, and the note will be gone.