Since you have filed and you have already received your refund, you will need to amend the return to add the additional W-2.
You can go here https://ttlc.intuit.com/questions/3061514 and get instructions for how to amend the return.
- And if you then need steps on how to enter that W-2, you will find those here https://ttlc.intuit.com/questions/2866494
Amended returns must be printed and mailed. They cannot be e-filed per IRS regulations. The address should be on the instructions page when you print it. If you are due another refund, that will be sent to you after the return has been processed and it can take up to 16 weeks to process an amended return. If you owe anything, you can mail that payment along with the amended return.
Once you mail an amended return, it can take up to 3 weeks before it shows up in the IRS's system. So give it that amount of time before you start checking for any updates on it. After 3 weeks, you can go here Where’s My Amended Return? to check the status of it.
And you can find a list of frequently asked questions, about amended returns, here Form 1040X, Amended U.S. individual Income Tax Return, Frequently Asked Questions
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