As an FYI, all comments are associated with your M1, M2, M3 and M4 grades (no others). Please make sure you are in the correct term before entering your comments.
Next, to find where to enter your comments, you must be in your gradebook.
In the final grade column right-click in the cell with the final grade. Choose Show Score Inspector in the drop-down.
Click on the comment tab. You may choose to use the canned comments, or type your own comments. Please remember to enter a space between canned comments and do NOT hit the return key. Continue your comments in paragraph form.
You may continue to the next student by clicking on the up and down arrows without leaving the window.
Once you are done, close the window and save your changes to your gradebook.