Your Rypple password must:
1. contain at least 6 characters 
2. not contain a sequence of 3 consecutive digits 
3. not repeat a pattern of 4 or more characters 
4. not contain 5 or more consecutive characters (alphabetically and across the keyboard) 
5. not contain the word admin, password or secret.

You can change your Rypple password at anytime, but going to your Name> Settings> Change Password.