If you are using the Online version you need to pay any fees first and then you can see all the forms.  Before filing you can preview the 1040 or print the whole return
https://ttlc.intuit.com/community/accessing/help/how-do-i-preview-my-turbotax-online-return-before-f...

What do you need to change?  You have to change it by going though the interview steps.  

Only the desktop download software has "Forms" mode which allows you to have direct access to the forms.  Online TurboTax does not include "Forms" mode.    If you are using online TurboTax, you can preview your Form 1040 and Schedules 1-3, but you cannot see any other forms or schedules until you have paid your fees.  Even then, you do not have direct access to the forms to make entries to the forms themselves.   Your information must be entered via the interview screens.

PREVIEW 1040

https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-return/preview-turbotax-online-retur...

https://ttlc.intuit.com/community/printing/help/can-i-print-a-copy-of-my-turbotax-online-return-befo...