We provide free instruction how to configure Mail.ru ID and Mail.ru Secret Key
Go to http://api.mail.ru/sites/my/add link and login with your credentials.
Accept "Terms and conditions" and click the "Next" button.
Enter your site Name "Name" field.
Add "Your site URL" : http://www.yoursite.com/
Click "Continue" button
Download "receiver.html". Put "receiver.html" in the root folder of your site.
Click "Continue" button
Copy the generated "ID"and "Secret Key"