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<?php
// enable editors to use ninja forms
// https://wordpress.org/support/topic/works-but-there-is-capabilities-problems?replies=7
function ninja_forms_update_capabilities_filter(){
   return 'edit_others_posts';
}
add_filter( 'ninja_forms_admin_menu_capabilities', 'ninja_forms_update_capabilities_filter' ); // Show Ninja Forms menu
add_filter( 'ninja_forms_admin_add_new_capabilities', 'ninja_forms_update_capabilities_filter' ); // Show "Add New" submenu
add_filter( 'ninja_forms_admin_all_forms_capabilities', 'ninja_forms_update_capabilities_filter' ); // Show "All Forms" submenu
add_filter( 'ninja_forms_admin_submissions_capabilities', 'ninja_forms_update_capabilities_filter' ); // Show "Submissions" submenu
add_filter( 'ninja_forms_admin_import_export_capabilities', 'ninja_forms_update_capabilities_filter' ); // Show "Import / Export" submenu