My tax return didn’t go through cause of my missing w2 2018 I just need help with finding the site to send it to the app

You do not need a 2018 W-2 to e-file a 20`19 tax return.  You only need the 2018 AGI from the 2018 tax return that you filed last year.

The 2018 AGI is on the 2018 Federal tax return you filed Form 1040 Line 7

https://ttlc.intuit.com/community/agi/help/how-do-i-find-last-year-s-agi/01/25947

To access your current or prior year tax returns sign onto the TurboTax website with the userID you used to create the account - https://myturbotax.intuit.com/

Scroll down to the bottom of the screen and on the section Your tax returns & documents click on Show.  Click on the Year and Click on View adjusted gross income (AGI)

Or go to this IRS website for free federal tax return transcripts - https://www.irs.gov/individuals/get-transcript

If your tax return continues to be rejected with the 2018 AGI then enter a 0 (zero) for the AGI and e-file again.

If this is also rejected then you will have to print and mail the tax return.

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...