Hello,
I am sorry to hear you are having problems with your app!! The GoTalk NOW does have a different passcode than the iPad itself, so they may have that two mixed up!
You can bypass this by going into your iPad settings. In the left column, scroll to down to the apps and find GoTalk NOW. You will see the GoTalk NOW settings listed. Scroll to the bottom of these, and turn Go To Main Menu On Next Start Up - ON. This will allow you to get to the main screen that very next time you open GTN. From here, you will go into the settings within the app, and either check what that passcode is set to, or turn this feature OFF.