Sometimes it is useful to add a description to indicate how to fill out a specific content control that has been added to an online form. When someone uses the form, these instructions are replaced with the actual content.
1. On the Development Tools tab, in the Controls group, click Design mode.
Figure 1
2. If you have not yet added a content control to the document, click where you want the control to appear, and then click a control.
Note: If the content control is not available, you may have opened a document that was created with an earlier version of Word. To use a content control, you must convert the document to a Word 2007 file format by clicking the Microsoft Office button, clicking Convert, and then clicking OK.
3. Click the content control in which you want to revise the placeholder text.
4. Edit the placeholder text and set it to the desired format.
5. If you want the content control to disappear when someone types its own contents in a rich text control or text control, click Properties in the Controls group, and then select the Delete content controls when content is edited check box.
Figure 2