The certificate of rent paid is entered in the state portion of your tax return. If your state has a renter's credit, TurboTax will guide you through the process and will ask for the information.
There is not a rent deduction or credit on your Federal return. If your state has anything for renters you will be prompted to enter your rent info when you complete your state return. As far as I know, the states that have anything for rent are Vermont, Michigan, Maine,Maryland, Massachusetts, Minnesota, Missouri, New Jersey, Rhode Island, California, Hawaii, Indiana, Arizona, Wisconsin, and Connecticut.