If you are in the review, exit and go back to your MA state return. Select Continue or Go back over MA. Click through the screens until you come to the page titled Health Insurance Information. You can edit your HC-1099 info from there.
If you want to delete the form and re-enter it, use the instructions below to remove the form before going back through the state return interview screens.
How to delete forms in TurboTax Online
How to delete forms in TurboTax Desktop
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