Turnitin can be used two ways within Canvas:

• Plagiarism Review - When enabled in a Canvas Assignment, it allows instructors to utilize all of the native Canvas features such as Canvas Rubrics, differentiated due dates, peer review, group assignments, multiple submission attempts, or use the SpeedGrader for student feedback.
• External Tool - Ideal for use with Turnitin rubrics, PeerMark, or provide student feedback using Feedback Studio and GradeMark.

Turnitin is also accessible through their website.