Sorry, you are not allowed to edit administrator permissions.
If you think you should have permission to access this page, you will need to edit the $config['SpecialUsers']['superadministrators'] variable in the includes/config.php file.
To allow the administrators to access this page, edit the variable to include the user IDs of those administrators should have access, separating each user ID with a comma, like this:
$config['SpecialUsers']['superadministrators'] = '1,25,57';
To allow only a single administrator to access this page, simply add that user's ID with no commas, like this:
$config['SpecialUsers']['superadministrators'] = '1';