You do not have direct access to the forms when you are using online TurboTax. You enter your information on the interview screens and the software fills out the tax form for you. Only the CD/download has Forms mode.
You can peek at your Form 1040.
PREVIEW 1040
https://ttlc.intuit.com/questions/1901539-how-do-i-preview-my-turbotax-online-return-before-filing
Click on Tax Tools on the left side of the screen. Click on Tools. Click on View Tax Summary. Click on Preview my 1040 on the left side of the screen.