1 - Go to the Operations menu and select 'Issues'.
2 - Click on the Issue you would like to add a Note to.
3 - Click 'Edit Issue'.
4 - Scroll down to the 'Add New Note' box, type in your desired Note, and click 'Add Note'.
5 - The Note, along with any made in the past about this Issue, has been added.
6 - Scroll up and click 'Update Issue' to save the Note and any other changes made to the Issue.