When I press on the developer console and try to paste in the code it literally will not let me paste anything in. I have tried refreshing, closing the tab and opening a new one, nothing works.

Sorry you're stuck but there's almost always a pretty easy fix! Do NOT try to start all over again, eg. uninstall Max's Pitch Package, etc. That can make things worse.
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post in the right category
INCLUDE AT LEAST ONE SCREENCAP IN YOUR POST TO SHOW THE PROBLEM!!!!!!!!
explain the problem clearly
Yeah, as the instrutions say, once you have that window open, you need to open the execution window and paste in the one line of code there. Might be a good idea to watch the explainer video at the top of the grader screen.