I forgot to do taxes for one job.

[marcos-j-vasquez]

I can't go back and add it on here, since I already recieved my return. What do I do?

[AndreaC1]

If you have already received your refund from your original return, you will need to amend it to add any additional tax documents you may have received. And you can go here and get instructions https://ttlc.intuit.com/questions/3402261 for amending that return. 

If you haven't received your refund yet, wait until you do and then amend the return to add what you need. 

See some reasons you'd need to amend your return below

https://ttlc.intuit.com/replies/3318732