Slow down.    You cannot amend a tax return that was just accepted.   You have to wait for it to be processed by the IRS.  Trying to send in an amended return while they are still processing the original return could confuse things and delay your refund for months.

Do not try to change anything on your return now.  When you amend, your Form 1040X has to be prepared from the return exactly the way it looked when you filed it originally.   You have to wait.   Once your return has been processed you will complete a Form 1040X   --- which is not yet available --- and submit it to amend the mistakes made when you filed your original return. It takes the IRS at least four months to process an amended return.

UPDATE:  My state return is still pending.  I bet they both have to be accepted for the "amend" option to be available.

The federal 1040X will not be available until the end of the month.   Trying to send in an amended return while the IRS is still processing your original return could create confusion that would delay your refund for months.  WAIT.