Ohio SD 100 School District Income without W2

[OhioGene]

I am retired, so I don't have a W2.  My income comes from Social Security and a pension.  Where do I enter my school tax code and how do I calculate the Ohio SD 100 School District Income Tax Return.  Also, I submitted my tax returns for Federal and State without the SD 100 Return.  How do I go back into Turbo tax to revise my return to generate the SD 100 return?

[ReneV4]

If you have already filed your return and it was accepted, you will not be able to go back and add your Ohio SD100.

Instead, you can visit this link to OH/TAX eServices - File Now.