You need to print and mail the return. There should have been instructions with your print out. Please see this FAQ for additional information:
https://ttlc.intuit.com/replies/3401713
If you like to e-file instead of mailing your tax return then please see the instructions below:
https://ttlc.intuit.com/replies/5561257
[Edit 3/31/2019 12:47]
