If the e-filed return is rejected, you fix the reason for the rejection and e-file again. If the e-filed tax return continues to be rejected then you print and mail the tax return. You cannot amend a tax return that has never been filed and accepted.
See this TurboTax support FAQ for printing a tax return for mailing - https://ttlc.intuit.com/community/printing/help/how-do-i-print-and-mail-my-return-in-turbotax-online...
