The plugin doesn't work (Joomla 2.5.)

Hello!
Thank for this plugin! It seems, I have problem with the plugin.
There is content (Joomla Article), that I try to filter.

Guests (unauthorized users) must see this text and registered users no.

In Joomla Article is the following:

{f90filter Unregistered SHOW}
<p>Text Text Text Text Text Text Text Text Text</p>
{/f90filter}

But this text is shown not only for Guests, but also when I log in as Registered user.

You have selected 2 usergroups here. Please select the Guest usergroup and try.

You should upgrade Joomla also, it is not safe to use Joomla 2.5

I have selected the Guest group, but there are no changes. And guests and logged in users see the same content.

Hello,

You have created group with name f90filter, then you need to use code

In places of Unregistered, you need to use the name, which you gave in plugin configuration.

Thank you very much! Now I understand how it works.
Best Regards!