Fill out an application for a disability parking certificate. This application can be obtained through your state driver vehicle services (DVS) website, visiting a local DVS license bureau or calling the DVS to have one mailed to you. The Unofficial Guide to the DMV website provides links to each state's division of motor vehicle website.
Bring the application to a licensed physician or chiropractor to have them fill out and sign their portion of the application.
Bring the completed and signed application to a DVS or motor vehicle licensing office, or mail it back to the state DVS or other location designated by the state for processing. Fees vary by state and the type of certificate for which you apply. If you bring it in, you will be given a temporary permit to display while waiting for your official certificate. Applications take approximately four weeks to process.