If you find CBEs you would like to take you'll want to reach out to your student advisor to confirm they will help fulfill your degree requirements. Your student advisor will also help get you registered for a CBE. See How do I register for a CBE? for more information.
CBEs count as transfer credits CBEs, so keep in mind that there are transfer credit limits . See How many credits can I transfer? for limitations and ask your Student Advisor for any clarification.