Creating a Turnitin Assignment in Canvas

In your course, click the Assignments link from the course menu
Click the + Assignment button in the upper right
Give the assignment a title, instructions, and points possible
In the Submission Type field, choose External Tool
Click the Find button
Scroll down the list and select TurnitIn. Click the Select button.
In the Assign section, set a due date and an Available From date. This is important as the assignment will not load correctly if these values are left blank.
Click Save or Save and Publish if you’re ready for the assignment to be visible to students
You’ll see the TurnitIn Assignment Inbox upon completing these steps
You can set additional settings within the assignment by clicking the Settings button in the upper right corner of the TurnitIn interface, and then clicking Optional Settings