Removing Smart Slider 3's capabilities - WordPress

Write this code into the very end of the website's wp-config.php file:

global $wp_roles;
$wp_roles->remove_cap( 'administrator', 'smartslider' ); 
$wp_roles->remove_cap( 'administrator', 'smartslider_config' ); 
$wp_roles->remove_cap( 'administrator', 'smartslider_edit' ); 
$wp_roles->remove_cap( 'administrator', 'smartslider_delete' ); 
$wp_roles->remove_cap( 'editor', 'smartslider' ); 
$wp_roles->remove_cap( 'editor', 'smartslider_config' ); 
$wp_roles->remove_cap( 'editor', 'smartslider_edit' ); 
$wp_roles->remove_cap( 'editor', 'smartslider_delete' ); 
$wp_roles->remove_cap( 'administrator', 'nextend' ); 
$wp_roles->remove_cap( 'administrator', 'nextend_config' ); 
$wp_roles->remove_cap( 'administrator', 'nextend_visual_edit' ); 
$wp_roles->remove_cap( 'administrator', 'nextend_visual_delete' ); 
$wp_roles->remove_cap( 'editor', 'nextend' ); 
$wp_roles->remove_cap( 'editor', 'nextend_config' ); 
$wp_roles->remove_cap( 'editor', 'nextend_visual_edit' ); 
$wp_roles->remove_cap( 'editor', 'nextend_visual_delete' );

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Then just go to the website anywhere; this code will delete the capabilities we have given. After that you can remove this code from where you put it.