@marco.C,
Where is the subscription for directing to? Subscribe2 probably isn’t available on that page to process the input. Did you create a WordPress page as recommended in the installation instructions?
Yes I have a wordpress page,but what do you mean with the subscription direction?
@marco.C,
The plugin allows you to define where the user is directed when they submit the form data. If you are using the shortcode this setting is on the Subscribe2->Settings page in the Appearance tab where it says “Set default Subscribe2 page as”. In the Widget the option is on the Appearance->Widgets page after opening up the Subscribe2 widget so you can see the settings. You need to select a page where the Subscribe2 shortcode or widget is available so that the information submitted can be processed.