This form must be completed as part of the application. _____ By signing this form, I certify that I have the ability to engage in substantial gainful activity.Dated: August 2, 2023. Kindly fill out and sign the highlighted portions of the authorization letter. Find and download various legal forms, brochures, and self-help kits. If a form does not open, right-click the link to save it to your computer. Please fill in the appropriate title in the space above.