I assume you are a tax resident of MA.
After entering your 1099-R in the Federal section of TurboTax, then go to your MA taxes.
You need to continue through the MA state screens until you get to the screen, Taxable IRA/Keogh Distributions. On that screen, there is a box to enter "Other Contributions Previously Taxed by MA" This is where you should enter your previously taxed contributions.
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