I already filed my taxes yesterday but today I got a new text paper

[ddaven12]

If you have already filed your tax return you need to first wait and see if your return is accepted or rejected. If rejected, you can go back and add the Form and then re-submit your return.

If accepted, you need to wait until you receive your tax refund and then Amend your tax return. The Amending instructions will be available mid February. 

Here is an FAQ with additional information on Amending(Available mid February): https://ttlc.intuit.com/replies/3288565