Hi NhatLee233! That feature is called the "Test Vibration" or "Virtual Tip" function in the Lovense caming extension. You can find it by opening the caming extension panel during your live stream — look for the settings or tools section, and there should be an option to send a test tip/vibration to simulate a viewer tip. If you're having trouble locating it, it may depend on which cam site you're using. Feel free to reach out to our support at [email protected] and the team will be happy to help you get it set up again! 💕