To edit messages, go to the Messages editor and select the Message whose phrasing or settings you want to adjust.  Individual components are edited using different properties.  Many common properties are explained on the Message Properties Supplemental page. You can edit messages from the General tab or within the visualizer (Visual tab).

If a new Message was created to keep from impacting other services, assign the new Message now prior to testing. Open the Services editor and go to the Messaging tab. Double-click on the Message's Property value, select the new Message from the drop-down, hit Enter, and select Save.

Please allow 30 minutes for the system to process and store new Messages before testing. Assigning and testing right away may result in errors or an inconsistent experience.