Please go to vk.com developer site to configure login https://vk.com/dev

  1. Click to My Apps on the top menu.
  2. Click to create an application and fill information.
    – The platform must be “Website
  3. Click to connect site and go to settings on the new screen.
  4. Copy App ID and Secure key and paste to PF Settings > Additional Settings Panel > Social Login Settings section.