How can I get estimated payment vouchers for 2019 if returns are already filed/printed?

I am self employed.  I prepared and e-filed my 2018 Federal return and printed my State return for mailing this year and did not receive any estimated tax vouchers for 2019 along with the copy of my completed returns.  Because the returns are now filed/printed I cannot access the program again to enter information to calculate estimated payment amounts for this year.  How can I get this information?