Enter your ssa-1099R, but you don't enter the Medicare payments there.
You enter the Medicare amount you paid in the Deductions & Credits section.
You don't enter it on a form even if it listed on your ssa-1099-R
You need to go to the screen that lets you enter the amount
Click Federal
Deductions & Credit
Scroll down to Medical Expenses
Click Edit or Start
Go through the screens until you get to "How much did you spend on insurance premiums?'
and enter there
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