You should see a message indicating it was added to your shopping cart towards the top:
and you should see it in your semester shopping cart:
You can click on the trash can icon to remove a class from your shopping cart. Once you are satisfied with your choices, click on "Proceed to Step 2 of 3" to register for the class. Please note: In order to be officially enrolled in your classes, you must complete steps 1, 2 and 3 of the registration process and pay for all fees.