The best way to edit any of the tax forms created by TurboTax is to go back through that section in the step-by-step process.
However, if you are using one of the CD/downloaded versions of TurboTax, you can use Forms Mode to directly edit the form itself. Click Forms in the upper right corner and then select the form from the list on the left side of the screen. Be careful that you are not overriding any entries as that will void any guarantee with TurboTax.
If you are using TurboTax Online, there is no method to directly edit any tax form. You must make changes by going through the step-by-step process.
If you need assistance to navigate to a particular entry, please provide further details and someone may be able to give you guidance.