When there is a new submission to your group, you will get an email and Dashboard notification. The submission will display on the group’s page in the Critique panel. This signals the beginning of the Critique period (the time when group members can make inline comments and share their general feedback). Group members can make comments on the document until its deadline.
Go to your group and click the submission name to open it for critique. Make inline comments throughout by selecting text. Give overall feedback in the comment box at the bottom. Both inline and overall comments save automatically.