After you purchased your discount package you were provided with a promotional code equal to the amount of credit hours that you purchased.  First you need to locate this code.  Go to your account information page and scroll towards the bottom.  You will see your promotional code along with the amount of hours remaining.  Write down your code (including the word Titan). 

Now go to the online course catalog and select individual courses.  Select a course and add it to your cart and click 'check out'.  After you click check out you will enter your promotional code and finalize the transaction.  Your course is now available for you to take in the 'My Courses' area of your account.  Your account information page will update with the amount of hours remaining on your code whenever you use it, so you don't need to keep track of it on your own.