If you have already filed your tax return and you left off some income ,  you can file an amended return to fix it. But first you have to wait. 

 If the IRS rejects your tax return, all you have to do is make the changes on your return and refile.

If the IRS accepts your tax return, wait until you receive your refund, or your payment is processed. Then, go to the link at the bottom of the page for instructions.

Amended returns do not “catch up” to your original return and replace them; they are processed as two separate returns.  

Amended returns have to be printed and filed by mail.  It can take the IRS up to 12 weeks or longer to process them.   If you are due a larger refund than on your original return, your amended return should only show the difference and you will receive a separate check for it.  If you owe money on your amended return, it will show only the new amount owed, you will have to mail a check with the return.

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did you find out what happens I had a few and just found one that I didn't claim. 

Once your return has been accepted, you will not be able to make any changes until after your refund has been processed. Amending your return means filing a new form, 1040X. This is only required in certain situations. In other situations, you can change your original return and you should not file a new form. Please click Do I need to amend? to learn more. 

You should not try to amend your return until it has been fully processed and you have received your refund or your payment has cleared.  Amended returns do not “catch up” to your original returns and replace them.  They are processed as two separate returns.

Please click How do I amend my 2019 TurboTax Online return? to learn more.