To finish or make corrections, if you can no longer make changes to your return, but before you've e-filed or mailed your return, you can "add a state" to make changes:
1. Sign In to TurboTax Online
2. Click "My TurboTax" menu
3. Press "Visit My Tax Timeline"
4. Under the "SOME THINGS YOU CAN DO" heading, choose "Add a state" (you're not really adding a state, this allows you to get back into your return).
5. Complete/correct as needed.
As far as the credit form that is being included that you are having difficulty deleting, if you haven't tried deleting the form related to the credit, please go to TAX TOOLS/TOOL/DELETE A FORM from the menu in black on the bottom left. Scroll down to the Maryland Forms and delete anything related to credits including Forms, Worksheets and/or Schedules.
Here is an additional article related to making rejection corrections. Rejected Returns
If you continue to experience this issue after trying the above, please contact Product Support/Customer Service: Product Support/Customer Service
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