Scenario/Problem: You want to fill a form in a SharePoint form library.
Solution:
In a form library, you can fill a form by clicking the New Document
button in the Files 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).
FIGURE 1 A form open for editing in Microsoft InfoPath Filler.
FIGURE 2 A form open for editing in the browser.
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.