After installing the plug-in, you should register it.
Instructions for registration you can find here:
http://www.pushok.com/soft_how_to_register.php.You should perform the steps described there.
In automatic mode, the registration happens automatically.
In manual mode, you must open the page
http://www.pushok.com/soft_short_info.php and create a trial license by
clicking the link "try now".
After that, your account will able to generate trial license keys.