If got one of my w2 in the mail and didnt file it can i file it bext year

[DoninGA]

A 2019 W-2 can only be entered on a 2019 tax return, not some future year return.

Once a tax return has been e-filed it cannot be canceled, retrieved or changed.
If you have e-filed your tax return and need to change, add or delete information on the tax return then you will need to wait for the tax return to either be accepted or rejected by the IRS.
If the tax return is rejected then you can make your changes and re-file the tax return.
If the tax return is accepted then you will have to amend the tax return to make your changes. An amended tax return, Form 1040X, can only be printed, signed, dated and mailed by you to the IRS, it cannot be e-filed. The IRS will take up to 4 months to process the amended tax return. Wait until you have received the tax refund or the taxes owed have been paid and processed by the IRS before amending the tax return.

On the Tax Home web page when the Form 1040X for amending a 2019 tax return becomes available there will be a link - Amend (change) return

[xmasbaby0]

NO.  You cannot wait and use a 2019 W-2 on a 2020 tax return next year.  You will now have to wait for your 2019 return to be fully processed and then amend it to add the extra income.  

How do I amend my 2019 TurboTax Online return?

A 1040X cannot be e-filed.  It must be printed and mailed.  It will take about 4 months for the IRS to process an amended return.  It is a good idea to use a mailing service that will track it, like UPS or certified mail, so you will know it was received.

Wait about 3 weeks from mailing and you can check the status of your amended return:

https://www.irs.gov/Filing/Individuals/Amended-Returns-(Form-1040-X)/Wheres-My-Amended-Return-1

https://www.irs.gov/filing/individuals/amended-returns-form-1040-x/amended-return-frequently-asked-q...

https://ttlc.intuit.com/questions/1908543-do-i-need-to-amend

https://ttlc.intuit.com/questions/3318997-how-does-the-refund-math-work-on-amendments

The 1040X becomes available later in February, so you have to wait for it.  If your return is still being processed now, it would not be a good idea to amend yet anyhow.  Sending in an amended return while they are still processing your original return could cause confusion that would delay your refund for months.

Check back later for the 1040X.   AFTER your return has been fully processed.