When the window opens, you will see "Post" under the "In Progress" tab, above "Grade"
If you do not see this section, you will need to expand the "Grade Tools" to see it.
In the next box, click "OK" at the bottom
It will tell you grades will be posted when you hit save, click "OK"
To fill a comment to the whole class, click "Fill" above "Rpt Crd Comments" (do this before going back and setting individual comments)
For individual comments, click the "CC" to enter a canned comment
Click the comment or comments then hit "Save" at the bottom.
You MUST hit Save in the top left to finish submitting grades:
Now repeat for each class.