Sanvello will send you a reminder to complete a daily mood check-in. You have some options on when you receive this prompt. You can choose a time that works best for you, or choose to receive a reminder randomly throughout the day, or after 7PM.
To make changes or disable the mood reminders, open "Notifications and Preferences" in your Account Settings. (Account Settings can be found by tapping on the gear wheel icon in the upper right corner of the ME page in your app.)