I finished my taxes and need to enter the medical portion of my auto ins prem. I cannot return to the medical insurance or HMO premiums reduce household resources screen.

Are you still in the federal section of TurboTax?

 

Medical expenses are found under 

Deductions & Credits

Medical 

Medical Expenses

 

UPDATE

 

Continue through the interview until you get to the "How much did you spend on insurance premiums?" screen

Add the amount to any amount you already entered for "Medical insurance premiums".