Click the check image below for the form. Before filling out the form you can find additional information here General Info about mainstream vouchers can be found here

Non-elderly person with disabilities (for purposes of determining eligibility):
A person 18 years of age or older and less than 62 years of age, and who:
(i) Has a disability, as defined in 42 U.S.C. 423;
(ii) Is determined, pursuant to HUD regulations, to have a physical, mental,
or emotional impairment that:
(A) Is expected to be of long-continued and indefinite duration;
(B) Substantially impedes his or her ability to live independently, and
(C) Is of such a nature that the ability to live independently could be
improved by more suitable housing conditions; or
(iii) Has a developmental disability as defined in 42 U.S.C. 6001.