After you file

Why can't you efile?  Did it reject?  You can still efile until Oct 15.  If you are getting a refund there is no penalty for filing late.  

How to efile,  https://ttlc.intuit.com/questions/1900599-how-do-i-e-file-my-personal-individual-tax-return

How to print and mail https://ttlc.intuit.com/questions/1944348-how-do-i-print-and-mail-my-return-in-turbotax-online.