You enter your MD state estimated taxes in the TT/Federal return - all TT/State tax payments are entered in the federal return.
Enter _estimated_ in the Find box and select estimated tax payments. Click Start (or Update if you've been there already) on State estimated taxes for 2017; click Yes (you paid state estimated taxes for 2017). In the next screen select Maryland for each payment and enter the amount. Adjust the dates if yours are different.
The "menu" way to drill down there is:
Federal Taxes tab
Deductions and Credits
I'll choose what I work on
Scroll down to
Estimates and Other Taxes PaidEstimates <Start>
State estimated taxes for 2017 <and so on...>
Be sure to remove those TT/MD uneven withholding entries as well.
