Do the following to change your Cloud Sync account password:

1. Go to the Settings/Preferences of iStudiez Pro and uncheck the option to use the Cloud Sync service

2. Check the option back and tap/click "Sign In" button to sign into your account

3. Tap "i" button when on iOS or click "Forgot Password" button when on a Windows PC, Mac or Android to reset your password

4. Follow the instructions from the email you will get to change the password.