Universal Credit is a monthly payment to help with your living costs if you're on a low income or out of work.
To claim Universal Credit you have to apply online at Gov.uk
If your tenant wants to claim Housing Costs, they may need proof from their landlord that they have been paying for housing.
If you have made a Universal Credit claim but are unable to manage until your first payment, you may be able to get a Universal Credit advance..
You do not need to do anything if you are already claiming benefits as you will be told when Universal Credit will affect you.