(If you have a non-English version of Word, see Non-English Word below.) To add, remove or rearrange fields, create a new layout in a Word document, then save it as a new AutoText entry named AddressLayout. Test it by using the Insert Address button to insert an address from your Address Book. Word includes a default AddressLayout entry that you can't see or edit directly. The Insert Address button makes it easy to add an address to any document. Drag that command to any toolbar currently displayed in Word. Near the bottom of the Commands list, you'll find Address Book.
If you're going to add address information to documents frequently, having a button available will make it easier. Word 7.0 includes an Insert Address button on its Standard toolbar, but newer versions of Word don't add the button to the Toolbar or ribbon.