WP Custom Menu Filter Plugin Settings

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I need a plugin or way how to customize menu to users roles
not logged / logged / authors ....
to hide some pages .... I found that plugin but it gave me error ...

does it happen if you temporarily swap to the twenty-ten theme?
If so it's not a theme issue and you should contact the plugin's author

ok now it works

it asks me about the

CSS Class Name:
Enter the CSS class name for items that you want to be hidden from users not logged in.

where can I get the css class ? pls

view a page and then look a the source of the page and you will find all the classes.