In a form library, you can fill a form by clicking
the New Document button in the Documents ribbon. Clicking this button
opens the form either in the browser or in Microsoft InfoPath,
depending on the configuration of the form and on whether you have
Microsoft InfoPath installed (see Figures 1 and 2).
If
the library is configured to have more than one form, you can open the
drop-down menu for the new form, the same way you do when creating
items or documents from different content types.