Look for the “Unknown sources” option.Scroll down and tap on the “Security” or “Privacy” option, depending on your Android version.You can typically find the Settings app in your app drawer or by swiping down from the top of your screen and tapping the gear icon. Go to the Settings on your Android device.However, you can easily enable installation from unknown sources by following these steps: By default, Android devices only allow installations from the Google Play Store for security reasons. Before you can download and install the Onlyfans app on your Android device, you need to enable installation from unknown sources.