Please complete the following:
- Go to the plugin main page “Google Shortlink by BestWebSoft” in the main menu (Dashboard).
- Go to Additional options tab.
- Set "Scan web-site for new external links" option on and click the button “Apply” below. Scanning your website may take some time, don’t be afraid, it’s normal.
- Now you can manage those links as your wish with options on the main page. In particular case to replase all external links to short links set “Replace automatically all external links” option on and press “Apply button”.