When you or a TA create a peer review assignment, you can assign peer reviews manually or you can have Canvas assign them automatically [1]. Group assignments can also be assigned peer reviews.
When a peer review has been assigned, students can view a notification in their Dashboard To Do sidebar or Activity Stream [2]. Students will also receive an email notification.
If the assignment is not an On Paper or No Submission assignment type, students can also view the peer review information in the sidebar of the assignment details page.