I see only the menu contents but not drop down

In Daleri Sweet 1.2 , i’ll see only the contents at once but not drop down funtionality.

http://wordpress.org/extend/plugins/dropdown-menu-widget/

I also tested to insert a menu of categories with
<?php shailan_dropdown_menu(); ?> .
Again i see all the contents at once.

In the FAQ it says:

Adding a sidebar in wordpress is a quite easy task. You can read instructions here. If you don’t want to add a sidebar consider using PHP template tag instead.

I havent added a sidebar (to be frank i’m afraid to change that, i dont know how common is and if it creates other issues) I tried the php tag instead in the header template file of mine but again i see only the contents.

Also another question:

All the setting can change my menu (even if i inserted with php tag?) or php-tag inserted menus are controlled ONLY by the related tab (template tag) in the settings?