To show Live social login button, you have to enable the option Enable Live Login, that you can find in the plugin option panel.
Fill in the application registration form by inserting the required fields.
Insert the “Callback Url” value, that you find in the plugin settings dashboard, in “Redirect URIs” entry.
After saving the settings, go to https://apps.dev.microsoft.com/ and select the application just created.
In APP SETTINGS you will find Client ID and Client secret (v1).
These informations have to be pasted respectively into the plugin entries “Live Consumer Key” and “Live Consumer Secret”. If you have done everything correctly, your users will be able to login with their Live account.