Take the FAA aircraft dispatcher certification test.
Contact the FAA for test dates in your area. You must be at least 23 years old at the time of the test and must take the test within 90 days of completing your training course.
The first part of the test consists of 80 written questions covering basic aircraft dispatcher knowledge and takes 3 hours. The second part of the test is a practical exam and requires you to demonstrate mastery of flight planning, emergency protocol, pre-flight and departure procedures, in-flight practices, landing regulations, and post-flight procedures.