There is no submit button, it should automatically take you to a configuration page when you select one. If that isn't working, its possible the JavaScript is breaking down. If you open the developer console (usually F12) you can see if there are any errors in the console tab.
General help
Dropdown menus does not work
Cuộc thảo luận này đã bị khóa nên bạn không thể trả lời nó nữa.