You will need to login to your learner account, purchase the certification exam if not already enrolled from a MuleSoft Training course, prepare for the exam, schedule, and then take the certification exam.
NOTE: MuleSoft no longer supports taking certification exams at physical test centers.
This video overview (3:23) covers the process to purchase, schedule, and complete a MuleSoft exam:
MuleSoft also recommends you review the MuleSoft Exam Readiness Kit before scheduling your exam to help you best prepare your system environment for a smooth certification exam experience.
All MuleSoft Certification exams are available via online proctored exams.