okay, to answer my own question, i just discovered how to use driver talk.
1. push the silver " setup" button on the dash
2. push the "advanced" icon on your screen
3. push the " custom button"
4. scroll down and push " driver talk"
next, go back to your home screen, and on the right side of your home screen scroll up until you see the "driver talk" screen.
press the "talk now" bar and you have activated "driver talk".
finally, push " end talk" to disable driver talk.
hope this is helpful.