If this is the text on the tile that you want to change, this is done in the project settings. In the visual studio, click on the "Projects" menu at the top, and then click "PhoneApp1 Properties." Then change the values โโshown in the image below.

The top, called "Title", is for the applicator, and the first in the "Tile Options" section is cropped for the tile for the initial screen.
If you want, you can also change this in the WMAppManifest.xml file.
source share