While you are part of a study, you might receive occasional surveys to respond. For most cases, you don't have to do anything to start this surveys (unless you've been asked to report something, which is explained in Study Actions section). The study automatically starts a survey, and asks you to respond when you can.
When you receive a survey, Ethica icon indicating you are part of a study will change from:
If you pull down the notification bar in Android, you will see Ethica says you have a survey to complete:
Tapping on the Ethica notification here will take you directly to the survey. Alternatively you can open the Ethica, and you will see a notification on the top of home screen, asking you to complete a survey (a "You have a survey to complete" notification). Tapping on Start survey on the notification will also open the survey, allowing you to complete it.