Getting blank screen

Hi,

I can´t get Jmailalerts work. I have followed the instructions:

Download the latest version from here.
Install J!MailAlerts component.
Install and configure all the plugins you want to use.

-But when I click in component->jmailalerts I´m getting a blank screen.

PHP Version 5.3.3-7+squeeze16
Joomla version: 2.5.18