Hi! I'm sorry, but changing the password of a group is currently not possible. What you can do is create a new group and tell everyone the new details. However, we are currently rewriting our entire server backend in order to improve performance and to implement new features. In the future we are planning to add methods to either change the password of a group or ban/kick someone. If you need any further help, please let me know. (Disclaimer: I'm one of the developers of iZurvive)