I have some tags in my page and I am trying to make the search use them.

I go to "Pages and Themes">Attributes>Tags
there I tick:
Content included in "Keyword Search".
and
Field available in "Advanced Search".

Then I click on the button "Update Attribute", and I am brought back to the "Pages and Themes">Attributes page. But then if I go back to the Tags page I see that the system has NOT stored the settings, and the two fields are not ticked.
It is probably a problem of permissions. Where in the file system are those settings stored. Maybe I can just change directly the PHP. Or there is something else I should do?


Many thanks,
Pietro