We can tell you how to preview the Form 1040 in advance without paying. Or we can tell you how to pay in advance to gain the privilege to view/print/download all the forms at will during preparation.
You can't edit on the forms like you can in desktop TurboTax which has Forms Mode, but you can view them.
Also, you may want to pay in advance anyway. If you don't file by the end of 2/28, Self-Employed Edition price will go up from 89.99 to 119.99 for a Federal return, and a State return will increase from 36.99 to 39.99.
Let me know if you want the steps for the free view of Form 1040, or how to pay in advance to see everything and lock in the price.
Here's how to preview Form 1040 prior to paying: