Has your original return been accepted? You should wait until it's fully processed and you got the first refund.
How to amend an Online return
Another way to amend is from inside your return. Open your return, you might have to select Add A State to get back into your return.
Then go to........
Federal Taxes or Personal (for H&B/Self Employed version)
Other Tax Situations
Do not try to amend your return until the original return has been fully processed---or it will create confusion and delays.
A 1040X cannot be e-filed. It must be printed and mailed. It will take about 4 months for the IRS to process an amended return. It is a good idea to use a mailing service that will track it, like UPS or certified mail, so you will know it was received.
Wait about 3 weeks from mailing and you can check the status of your amended return: