You can self-manage your certification exams, including registrations, date changes, cancellations, etc. by logging in to the Exam Portal through the appropriate course in CloudBees University (Use the “Access the Exam Portal” button in the Schedule/Log in to Exam lesson).
Please note that cancellations and rescheduling must be completed at least 72 hours from your scheduled exam time or you will have to repurchase your exam.
Of course, if you have special circumstances that caused you to have to make a change on short notice, you can request special consideration by reaching out to testingsupport@meazurelearning.com or certifications@cloudbees.com.