Go to Settings > General > Profile > Remove
This will remove all aspects of the Notes Traveler, including: Mail, Calendar & Contacts
Some versions will allow you to uninstall Notes Traveler simply by navigating to the following:
1. Menu > Settings > Applications > Manage Applications.
If you are unable to remove Notes Traveler successfully, you may have to temporarily disable Android's Device Administrator. This can be done by navigating to one of the following pathways, depending upon your Android version: