Download the application forms to fill out. Most of them can be filled out on-screen by clicking on areas and typing. Print out and mail in with the appropriate fees. All of them use the free Adobe Acrobat Reader software. If you get a "Bad Encrypt Dictionary" error, download a more current version of Adobe Acrobat Reader.
Note that the application requires personal information such as birthdates and social security numbers. To prevent identity theft, this information is not included on the main forms, but has been moved to a Personal Information Supplementary Form so it can be kept confidential. Please be sure to submit the supplementary form with all applications.