1. Open Settings out of the list of applications
2. Go to the bottom of settings, opening up systems menu
3. Scroll down the list, and open the heading called Programmable Key(s)
4. Choose the Select PTT Key App line to change the Push-To-Talk key; YELLOW for the yellow button; ALARM for the red button
5. You will be given a list of applications to choose from, and can use these buttons to open the application you select with a single push
6. To disable the button, scroll to the top of the list and select either No Application or No Action
7. Note, PTT is only supported by the default PTT button; changing PTT to the red or yellow keys will not allow your service to function
8. If your carrier updates their PTT application, it may reset these settings on your device; you will need to reapply your choices