The pearson account associated my canvas is not my own. The instructions on their website are obsolete. The options they instruct you to do aren't options in canvas.
Nicholas, the only thing I can think to do is to go to your course settings and go to Apps (tab) and see if you can remove or delete the integration. If not, then you can at least go to Navigation and move it down to the "not visible" links in your course.
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