Can't see checkbox "make admin" for menu elements

Hello and thank you for this module.
i'm trying to use delegate admin menu module, for this goal:
I mapped my Ldap Groups with Drupal roles.
I want to specify which role can edit, delete any content in which sub-menu.

I installed delegate_menu_admin, and i can specify access for a whole menu.
When i try to follow the quick start informations :
'4. If you don't want to give complete admin access to a whole menu, click on one of the menu links and give admin perms to only the sub-trees or sub-items of your choice.'

All checkboxes appear in one column, below the menu elements table like illustrated in attached file.

Could you please help me?
thank you.