This is a short tutorial on enabling Form fields in Microsoft Office 2007 and Microsoft Office 2010.
Microsoft Office 2007 Instructions
To add a form field to a word document first go to the developer tab
(if the developer tab is not showing, click the Office button -> Word Options -> Popular -> Show Developer Tab in Ribbon)
Once on the developer tab, click on Legacy Tools under the Controls section and select Text Form Field.
Select the field and click Properties under the Controls section.
Microsoft Office 2010 Instructions
Go to File > Options
Go to the customize ribbon tab and check developer.
The same rules as 2007 apply, click on Legacy tools and select Text Form Field.