To access the online course, register or log-in to your account by clicking here.

Then go to the Course you purchased, click on 'Take this course' and it will take you to the next page where you type in your voucher code on the space provided, then click 'Apply Coupon'.  

The Total should then be 0 dollars for the course.

Lastly proceed to check-out.  

Reminder that you need to check-out successfully then you should be able to access the course by going to your My Courses tab.