As long as you have not filed you taxes yet, you should be able to go back into the Federal interview section of the program to enter the additional information.
Depending upon what the 1099-S was for (as far as if it was for a rental property, 2nd home, or personal residence) will determine where you input will be for that 1099-S.
Please see the link below as it provides assistance as far as input for the rental property or 2nd home sale.
Input for sale of rental property or 2nd home
The following link provides steps for reporting sales of a main residence.
Personal residence sale
Your input in the federal interview section above will pull into your state return as applicable.
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