There are a number of options on the grading tool bar that you can use to leave feedback on assessments. The grading tool bar can be viewed once you enter the grading interface of a question from the dashboard.
See also https://crowdmark.com/help/grading-tools/ and also this video “Grading with Crowdmark” https://www.youtube.com/watch?v=qffoadRFI_c
Adding comments to student work: https://crowdmark.com/help/adding-comments/
Related articles