TurboTax Online (TurboTax.com) does not allow you to make entries directly on the forms. Anyway, TurboTax Online for 2016 will shut down permanently tomorrow night (Wednesday, Oct. 25).
If you use the CD or download TurboTax software, you can switch to forms mode and make entries directly on the forms. However, depending on the specific form, some or all of the entries may have to flow from other forms, schedules, or worksheets. You can't just enter anything you want anywhere on a form.
