How to refile my 2017 taxes that were rejected

Do you know the reason for the rejection?  If so, please post the rejection error code/message.   Depending on the reason for the rejection, some things need to be corrected, while some things won't need correcting, such as using the wrong prior-year AGI when efiling.

The 2017 return can no longer be efiled.  It has to be printed, signed, dated, and mailed.

If you used a paid edition to prepare the 2017 return, and if something needs to be corrected, TurboTax should furnish you the 2017 software as a download.

If you used a paid edition in 2017, you should still have access to the PDF file and the *.tax2017 data file.