First, find and click the application in the main interface of Samsung mobile phone, and then click Settings in the opened application.
Second, in the settings, enter more, and then enter security. In security settings, we check unknown sources, which means that applications from unknown sources are allowed to install.
3. Next, you will see an "unknown source" prompt, which says: Your equipment and personal data are more vulnerable to attacks by applications with unknown sources, and you agree that you are solely responsible for any equipment damage or data loss caused by using these applications. Here we can click OK directly.