I realized I forgot to add an additonal W-2 income after I submitted my refund. It was already accepted by the IRS before I tried to correct it. I filed an amendedment.

It would be unusual to enter an additional W-2 and not have a change.

• Did the amended return reset to zero, or did it show the original return Refund or tax due?
• Did you double check the entry of the new W-2?
• Did you run the Federal Review to confirm things were posted correctly?

The original filing showed a refund.  The amendment showed tax due.  

I was manually inputting the 2nd W-2 when I filed originally.  Took a break, and forgot to finish it.

I ran the Federal review when I originally filed and it passed.  Of course I was excited about the refund at first, but didn't notice anything odd until I took another look at my AGI after the return had been accepted.

"Nothing has changed"

Your 1040-X shows tax due. you can make the payment  here:

https://www.irs.gov/payments/direct-pay-with-bank-account

When you say nothing has changed, it seems as though it has changed.  You went from a refund to a tax due.  This is you paying back the part of the refund that you received erroneously. 

So if you are not showing that you owe money after you entered the W-2 and their is a 1040X in your return, then it sounds like you have done this correctly. 

What I meant when I said that, is the site still shows I have a refund coming.  Not a balance due.  

Wait for the original return to be completely processed and then submit the amended return.  For 2024 you can still E-file it.

Thank you