Certain modules in the online course are Flash based, and hence, are not functional on iOS devices. We are in the process of converting these modules to HTML 5 so that users will be able to access them on iOS devices, but these changes will be rolled out over the next few months. There is an iPad app available which contains the same content as the online course. If you write to us at [email protected] with the details of your subscription (length, language, and email associated with it), we can help you get access. 

best,
Erin