By Doug Lowe with Ryan C. Williams from "Word 2010 All-in-One For Dummies"
You may want a check box field in your Word 2010 form so that users can select or deselect it to provide a Yes or No answer. Check box fields work just like regular check boxes in dialog boxes: You click them to select or deselect them.
Obviously, a check box by itself is of little worth. Put some text in the template right next to the check box so that the user knows what the check box field means.
Follow these steps to create or insert a check box field:
1. Position the insertion point in the template where you want the check box field to appear.
2. In the Controls group of the Developer tab, click Legacy Tools and then click the Check Box Form Field button.
A check box form field is inserted.
There’s a similar control in the Controls group, but it doesn’t do the same thing. Be sure to use the control in the Legacy Controls drop-down menu.
3. If you want the check box to not be selected when the form is first displayed, you’re done. Otherwise, double-click the Check Box form field.
The Check Box Form Field Options dialog box opens.
4. Select the Checked option.
The check box is selected when the form is first displayed.
5. Click OK.
The check box is now inserted in the document.