If the return is accepted you will have to amend your original tax return. An amended return, Form 1040-X, can only be printed and mailed to the IRS if the original tax return was not e-filed. The IRS will take up to 20 weeks or longer to process an amended tax return.
Before starting to amend the tax return, wait for the tax refund to be received or the taxes due to be paid and processed by the IRS.
See this TurboTax support FAQ for amending a tax return - https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-return/amend-change-correct-return-already-filed/L4VjJ9BA2_US_en_US?uid=ld1n99kr
You will need to amend your return(s) in order to add your 1099-NEC form.
You won't be able to amend your return yet because the IRS hasn't released Form 1040X, the amended return form.
Check back in late February, when Form 1040X is typically released.
If you prepared your original tax return using TurboTax: