Mail.ru - setting up social authorization
Mail.ru - authorization setup through the social network
Beforehand it is required to set up a plug-in. Manager of extensions => Manager of plug-ins => group of plug-ins "slogin_auth" => plug-in "Social Login mail auth".
Go here and create new application. Enter name and site address and click Continue. On the next page download receiver.html file, put it to yoursite.com/receiver.html and click Continue. Now get Application ID, Private Key and Secret Key and enter them in corresponding fields in component settings. Save settings and enable Mail.ru login.