VNC via iPad to TP700

Hello:

I have a VNC app on an iPad and I am trying to connect to a TP700 via a local wireless connection. I have a Sm@rtService license on the TP700. When I open the VNC app and make connection to the IP address (192.168.2.51:5900) of the TP700 I am asked for an authentication password. I can not find any documentation in TIA Portal V12 WinCC Comfort or the Comfort manual to tell me how to change the required authentication password. Thanks for the help.