If you are using online software, you do not have direct access to the forms. Forms mode is a feature of the CD/download software. Any edits or changes made in online TurboTax are made by using the interview screens.
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
What version of TurboTax are you actually using? The tag below your question says TurboTax Free Edition, but you cannot have Schedule B in Free Edition. Are you using TurboTax Online or the CD/Download "Desktop" TurboTax software? What edition are you using (Basic, Deluxe, Premier, etc.)?
What exactly do you want to change, and why do you want to change it? Is it on Form 1040 or on Schedule B, or both? What specific line on the form do you want to change?