Assuming you didn't <a href="/wiki/Burn_the_note" title="Burn the note">Burn the note</a>, you'll need to <a href="/wiki/Ask_April_to_work_with_you_again_2" title="Ask April to work with you again 2">Ask April to work with you again</a> and then <a href="/wiki/Ask_her_to_teach_you_what_she_knows_about_the_Red_Science" title="Ask her to teach you what she knows about the Red Science">Ask her to teach you what she knows about the Red Science</a>.