Start by logging in to mySierra. In the Registration and Classes tile, click on Add, Drop or Withdraw from classes, then select the term. Refer to the Summary section of the registration screen (in the lower right corner of your screen) for the the following directions.
To remove a class from your registration
"Remove" is only an option before you complete your registration in mySierra. After you click on the Submit button, you will need to follow the steps below to "Drop" the class from your registration:

To drop a class from your registration
You can "Drop" a class prior to the Add/Drop deadline for your class.

Refer to the Important Dates tab in the Class Detail screen for specific dates.
