You must qualify & be approved for HUD housing? Are you over 65? Are you permanently & totally disabled? IF a single parent of a minor child, you must obtain child support from the other parent (unless deceased), and you must work over 30 hrs/wk.
When an application period opens with your town/city's housing authority, you submit an application. Application periods may only be held every 2-5 years & last 2-3 weeks. You will be interviewed, prove qualifications, income, etc. IF accepted, you are put on a waiting list. It can take 5-10 years before a voucher becomes available. You must recertify annually while on the waiting list, or be removed from the waiting list.