Adding a Comment
To open the dialog for adding a comment, click on the "Add a Comment" icon in the selection menu.
The dialog for adding a comment contains "Your comment..." field and the selected text above.
After clicking on the "Ok" button, the comments panel will automatically open with the newly created comment highlighted.
Also, next to the paragraph where the comment starts, you will see the indicator icon. If you click on the indicator, the comments panel will open.