1. From the sidebar, select links and click the icon on the desired link.
2. Enter the secret code and click save.
3. When you have finished setting the code, the icon will turn green.
4. Click the icon again to change the code by selecting change key or delete the code by selecting remove it
5. when someone wants to visit your link, then the first page will appear like this. enter the secret code you have created to access your link.