You can use the Swap function after you are successfully enrolled in your second choice class. To set up this feature follow this path:
Campus Connect > Student Center > Academics > Course Cart > Enroll > Swap
Once you have reached the Swap page, select the Term you are enrolling in and continue to the next page. Select the class from your current class schedule you wish to swap, and continue to the next drop-down box to choose the desired class you want to get in to.