I purchased Hooktheory 1 a few days ago and accessed it from the link sent to me in an email receipt. I am trying to continue reading it today and when I click that link it takes me to an outline page and when I click on any part of the book it says I need to purchase it. I am logged in and I can see the purchase receipt in my account. How do I access what I have paid for? Am I missing an easy tab somewhere? Any help is appreciated. Thank you.