The American Statistical Association invites you to apply for "Professional Statistician (PStat®)" status through its program of voluntary individual accreditation. Information for applicants, including the guidelines for accreditation, are found here.
The application process is completely online, and is available to all ASA members. (There is no longer a need to request the online application form.) Just log in to ASA Members Only, and then click on the PStat® button.
You may come and go from the application process as often as you like until you have completed the process and submitted your application.
Thank you for your interest.