You can view comments and grades by doing the following A or B:

A.
1. Open the file of your returned hw using MS Word
2. Click left button of mouse on "View" to get the pull-down menu,
3. Click on "Comments" in that menu.

Then you will see "Comments" at the bottom of your screen.
My comments are grades are there.

B.
You can also view them by bringing the mouse to a part highlighted with
yellow and holding it there. A litle rectangle will appear with comments
inside.