How to Tag an Issue to a Note:
Hover over the note you wish to tag to an issue.
Click on the note menu icon displayed as ☰ in the top right corner of the note.
Within the note menu, click on 'Issues.'
At this point, you can either select an issue from the drop-down menu to tag the note to, or click on 'Create a New Issue' to add another item to the drop-down menu.