Signing in for subscription in pay per view plugin

Hiya. A customer of mine who has singed up for a subscription using my pay per view plugin is having trouble signing in to access the content. I'm assuming what she has to do is go to the account that she signed up with (either Facebook, Twitter, Google, or Wordpress), sign in, and access a link to the site from there. Is this is the case? If so, where is the link to be found in each of the accounts mentioned above??