Launch URL, choose one based on your location:

https://api.turnitin.com/api/lti/1p0/assignment (ALL TURNITIN.COM (http://turnitin.com/) USERS) 

https://api.turnitinuk.com/api/lti/1p0/assignment (UK USERS ONLY) 

Consumer Key: This is what Turnitin calls the Account ID (this can be obtained from Turnitin directly)

Shared Secret: This is what Turnitin calls the Shared Key (this can be obtained from Turnitin directly)
Note: All 3 Items are mandatory and must be entered in order for the Integration to work correctly.