You must have the appropriate permissions to leave comments, assessments, or annotations on an item in a user's ePortfolio. You can receive permissions to comment on, assess, or edit a user's work in one of two ways:
Encouraging users to give you permission to comment on and assess portfolio items that relate to course work is an excellent way to provide users with informal, intermittent feedback.
Links:
[1] http://staging.docs.d2l/en/taxonomy/term/3