Log in to your College Board account. If you have ever taken an AP exam or the SAT, you have an account. Once logged in, click "Join a Course or Exam" and use the appropriate join code below:
5th period code: XYNARQ
6th period code: DA67Y3
To access assignments, click the AP Classroom button (marked by "2" in the pic below). If anyone finds a direct link, please let me know!