Hi I already filed my taxes for 2021 but I just received a 1099-NEC is there anyway to add it?

It depends. You cannot do anything to your return once you submit them. You will need to wait to see if your return was rejected or accepted. If it is rejected, you are able to login to your return to fix what you missed and refile the return.

If your return is accepted, then you will need to file an amended return. You should not try to amend your return until the original return has been fully processed and you have received your refund, or your payment has cleared.

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

Amended returns can be e-filed or it can 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. 

So if your return is rejected, you can login and fix it now but if accepted you will need to wait till you receive your refund or if you owed money, your check clear. Once that is done, you can amend it by logging back to your account.