Thanks tyhand,
It seems my excel has something wrong, when I goto view->Toolbars->customize, I can click "New" button in the tab "toolbars", then I goto tab "commands", I can see there
is a "New Menu" on the left, when I click the "New Menu" on the right side, it seems Excel won't let me change anything, this interface seems not editable, what's wrong with my excel or I should configure it to make it working?