In order to access Advanced theme weeks first please make sure Core modules is completed.
Here's the easiest way to open any Advanced theme week:
1. After launching the app select Lessons tab (on bottom when using a device and on top when accessing the program from a web browser)
2. From the orange (drop-down) menu on the top select Advanced theme weeks
3. Select any available Week & pick the next available module. You can watch one module/day.
See here screenshots with the instructions:
Or check out the screen recording with the steps written above: