If you are using online software, forms mode is not available. Forms mode is only a feature of desktop software. As already stated, using only forms mode instead of the interview screens to complete the return will void the accuracy guarantee.
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If you enter directly into the Forms that will void the guarantee and may prevent you from efiling.
The CD/Download Desktop you buy and install the program on a full Windows or Mac computer (a desktop or laptop), which can do unlimited returns. And you can buy any version. All the Desktop programs have all the forms, you just get more help in the higher versions. And the Desktop program has many other features over the Online versions. Like seeing and entering into the actual forms. And it has a What-If worksheet to test in.
The Desktop returns are only saved on your computer and can not be accessed from anywhere else. And not saved at Turbo Tax. So Be sure to save Frequently and make backups. You get 5 federal efile for free. In Deluxe and above you get 1 state PROGRAM download to prepare unlimited state returns (in that state). Each state return including the first one is $20 early or $25 (March 1) to efile or you can print and mail the state for free. The Desktop programs do not have the expert help that is available to add to Online versions.