Assuming the courses have the same cost, we can switch you over, no problem. Just contact technical support with the course you want out of and the course you would like to be added to. Please use the email address you used to create your account, so we can verify that you are the account owner.
If the costs of the courses are different, your best bet is to register (and pay) for the second course, and request a refund for the first. Make sure you tell us which course you need a refund for.