To use LinkedIn authentication on your website, you first need to register your application at LinkedIn and generate an API key for it. To do that, go through the following steps:
1. Go to at https://www.linkedin.com/secure/developer and log on using your LinkedIn logon credentials. You need to have a LinkedIn account in order to do this, so if you do not have one, please create it first by clicking the Join LinkedIn link in the logon form.
2. Once logged in, you will be redirected to the list of your registered applications. Click the Add New Application link.
4. If you specified all required details correctly, you will be redirected to a confirmation page. On this page, you can find the API Key and Secret Key values. These values need to be entered in setting of Kentico CMS in order for the LinkedIn authentication to be functional. See the Settings topic for more details.