Hello @chun_li ...
I don't teach any courses in Canvas, but I am a Canvas admin for our Technical College. I do have Turnitin set up in my sandbox course. Unfortunately, I cannot find any settings within the LTI version of Turnitin that allow for a statement/pledge that students have to agree to. Maybe this is something that you would need to include in the directions for your assignment? I'm going to bring @dhulsey into this conversation, because I know he has used the Turnitin LTI way more than I have. Maybe he has some other suggestions.
Also, Dallas has a really great blog posting over here Canvas and Turnitin that you might want to look through if you've not seen it yet.
Hope this helps!!!
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