If you can log in, but you're in the wrong course, click on the drop-down arrow the right of the name of the course you are in and you should see a choice of courses if you're enrolled in more than one.
If you don't have that arrow; You may not be using the correct web browser (Internet Exlorer or FireFox only, or you are not enrolled in more than one course, or your second course has not started yet. If there should be a second course and it has started, contact Customer Support.