What is the address for mailing a schedule b federal tax form that turbo tax said i will need to snail mail after e filing?

See the filing instructions document that prints out with the paper copy of your return. This will show any forms that need mailed and the address will be in those instructions. 
Please see the below steps to print or view it:
1. Sign back into your TurboTax Account Scroll down to the bottom of the screen and click "Add a State" (You will not be adding a State, this is just a way to get you back into your tax return)
2. Next select "Tax Tools" (left column) and then "Print Center"
3. Select "Print, save, or preview this year's return
4. Check the box for your State return (this will open further options)
5. Choose to include the "Government and TurboTax worksheets" 
6. Then click "View or Print Forms"