Generally, you do not enter your room and board expenses. "Housing'' is not a qualified expense for either a tuition credit or for tax free scholarship.
Room and board are qualified expenses for a 529 plan or CESA distribution. As such, TurboTax will not even let you enter room and board unless you have first entered a form 1099-Q for the 529/ESA distribution. Then, to get the screen to enter Room & Board, answer yes when asked if you have book expenses.