Setup Linked Login requires a LinkedIn membership and a LinkedIn app. Please follow the easy guide below to create yours.
Go to https://www.linkedin.com/developers, sign into your LinkedIn account.
The top menu bar, click My Apps, then click +Create app.
Go to website editor -> Site -> System -> on "System Pages" list -> Login, click on Login form to open Login setting. On Login Setting panel, scroll and click "Social Login" button, you will be at "Site Config" Member.
The LinkedIn Login single sign-on is available for your user to login to your website without make a new register.
Bonus
Disable and Enable your Linked Login
Go to website editor -> Site -> System -> on "System Pages" list -> Login, click on Login form to open Login setting. On Login Setting panel, scroll and look at Enable linkedin login.
A. Slide to left to disable or right to enable.
B. Click "Preview".
C. Click "Save" to save all of your setting.