After I filling personal information and at "Review page", the web app requires me to provide "Spouse's name, if filing together" which is mandatory, any ideas?

[sunwho707-gmail-]

Double confirmed I'm with Marital status "Single" so there's no spouse name to be filled.

[SForrestLO]

Somewhere within the program you probably entered your married. You will have to update that and it won't prompt you to add the spouse's information. 

Follow the directions below to return to the Personal Information section of your return to view.
Log in and click Tax Home.
Click the My Info tab from the left side of the screen. 

To check your filing status, try following these steps:
Login to Turbo Tax.
On the left side of the screen, click My Info.
Under My info, scroll down and click edit next to your filing status.