Why? Was the first one accepted? Or did it Reject? You can only submit it 1 time. If it was Accepted you need to amend to change anything.
Do you need to fix something?Maybe the IRS will catch it and change your return for you.
You should not amend until the first return has fully processed and you get the first refund or your tax due payment has cleared.
How to Amend
https://ttlc.intuit.com/community/amending/help/how-to-amend-change-or-correct-a-return-you-already-...
