Turnitin can be added to a Canvas course using the External Tool feature.

1. On the Home page of your canvas course, find the specific module you want to add a Turnitin assignment to, then select the + icon.
   
2. From the activity selector, select add Assignment, then choose [Create Assignment] from the list and hit Add Item.
   
3. Select the newly created link to open the Assignment settings.
   
4. Select the Edit button at the top right corner of the screen.
   
5. Set the points your assignment is worth in the Points field.
   
6. From the Submission type drop-down menu, select External tool.
7. Select Find.
   
8. Select Turnitin from the list.
   
9. Select Save at the bottom of the page.
10. Set the Start Date, Due Date, and Feedback Release Date settings as needed. Note that additional settings are available under Optional Settings. Once set, select the Submit button.
    
11. Once you are ready, on the Modules, click the Publish button to make the assignment visible to students.