nesta17 - the easiest way for a Sprint Navigation user to do this is login your account here:
http://navigation.sprint.com/snweb/. You can manage all of your addresses, recent searches, etc. here. You can also add and search for new destinations.
If you are a TeleNav GPS Navigator customer, you can manage your account on our web site at
www.telenav.com and click on "My TeleNav" at the top right.
Hope this helps.