Do you need to change the Form 1095-A information you entered? If so, use that link to add or edit your 1095-A.
To get back to the itemized deduction section, for all other health insurance premiums, search for medical expenses in TurboTax and use the Jump to medical expenses link in the search results. Answer YES to Do you have more than xxx in medical expenses? question. Then click through the screens until you come to How much did you spend on insurance premiums? It is near the end of the medical expense section of TurboTax.