For that purpose, mail merge is not the best application.  Better to use a
userform.

See the article "How to create a Userform" at:

http://word.mvps.org/FAQs/Userforms/CreateAUserForm.htm

and if you want to store the names and addresses that are entered, see the
last of the following series of articles:

http://www.mousetrax.com/techpage.html#autoforms

Please Fill Out This Form
Part 1: Create professional looking forms in Word
http://www.computorcompanion.com/LPMArticle.asp?ID=22

Part 2: Adding Automation to your Word forms.
http://www.computorcompanion.com/LPMArticle.asp?ID=46

Part 3: Learn more VBA (macros) to automate your forms.
http://www.computorcompanion.com/LPMArticle.asp?ID=119

Part 4: Use custom dialog boxes in your Word forms
http://www.computorcompanion.com/LPMArticle.asp?ID=127

Part 5: Connect your AutoForm to a database to save input time and keep
better records!
http://www.computorcompanion.com/LPMArticle.asp?ID=136