Log into your student portal and go to Student Academics and then "Course Schedule." Open that page. You will need to choose the semester/term. On that page, you will be able to search for the course you are looking for. Only classes with available seats will appear below. Click on class details. It will tell you how many seats are available. When a seat opens in the class you want, you need to unregister yourself for that class by going back to registration and pushing the minus button. Hit register drop, register drop. Then re-register for the class you want. You will want to check frequently, as there will be a lot of changes going on during high volume registration times.