One reason you may not be able to see your notes and lectures, is that you have signed in on the www.bsfonline.org webpage when you are registered in a local or in-person class. To see all your class content such as lectures, notes, etc., you will need to sign in at www.mybsf.org.
If you find yourself on the bsfonline webpage, you can select MyBSF Account in your account settings under your profile picture. Any of these options will get you to the MyBSF webpage where your materials can be found.