Navigate to Extend menu on your Drupal admin console and click on Install new module.
Install the Drupal OAuth & OpenID Connect Login - OAuth2 Client SSO Login module either by downloading the zip or from the URL of the package (tar/zip).
Click on Enable newly added modules.
Enable this module by checking the checkbox and click on install button.
Navigate to the Configure OAuth tab and search for your Provider/Application using the search box. If you can't find a desired application/provider, select Custom OAuth Provider.