Comments on Supernotes are quick and easy. Just hit the 'Comment Button'. Type you're comment and you are away.
Writing a Comment
Comments have full-markdown support, so you can draw attention to a piece of
code or want to emphasise your writing. To create a new line, use 'Shift + Enter', and 'Enter' to finish a comment.
Deleting a Comment
If you have the permissions (i.e if you authored a comment or the Card's Author/Moderator), you can delete a comment by pressing the 'Ellipsis' beside the date. Be careful deleting is permanent - you won't be able to get it back!