To swap a class, you must be already enrolled in a class. Here is a video that can show you how. Written instructions with pictures are provided below the video.
Click Current Schedule.

Click Swap.

Click on the Select A Class box.

From the drop-down options, select the class you want to Drop.

Select the class you want to enroll in. This can be done in three different ways. You can search By Class # (Each class has a unique 4-5 digit class number).

The second option is to select a class that is already in your Shopping Cart.

The third option is to search for a class by Subject and Course. This option will bring up all available sections of the course. (Check your filters if you cannot find a desired class.)

Select the course you want by clicking the circle to the left of the class. Select Swap.

Choose your Grading Basis and enter a Permission Number if applicable.

Select Finish.

Select Swap.
Select OK.

You are now swapped into the class. Please note, that swaps to do not work for Hidden classes or Co-requisite classes.
