EDITED AFTER ORIGINAL POST: If you selected to pay by check when preparing your TurboTax state return for MO, the program should have printed a 1040V, a voucher to include with your check when mailing in the taxes you owe. The mailing address should be on that voucher.
However, here's a link to the 2019 1040V from the MO DOR website. (Thanks for pointing that out, @JamesG1. This is the 2019 voucher). The voucher is form-fillable, meaning that you can type in the information into the fields, then print to be mailed.
https://dor.mo.gov/forms/MO-1040V_2019.pdf
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