Absolutely, @Chris_Hofer ! @LucyGettman , you can always access Turnitin through their webportal, and if you do not know your password, you can use your primary Canvas email and go through the password resent process.

Once you gain access, you can use the Quick Submit feature to check any student work from essays to discussion posts: https://help.turnitin.com/feedback-studio/turnitin-website/instructor/making-a-submission/activating... 

I hope that helps!

--Dallas