Until you complete all 3 steps of the FILE tab and click on the big orange Transmit Now button nothing is filed ... you can make any change you want until you do file  AND  you should always review the return BEFORE you file ... the program gives you that chance before you finish the filing. 

how do i make changes

@bridgebuidergirl If you have not filed, when you login to the app, click the 3 lines in the top left. This will give you a drop down menu, go to "My Info" to update head of household. If you are unsure where to find these menus, please see the video in the link below:

How do I use the mobile app?