Drop down menu not dropping down

Hi,
This is my first attempt building a WP site. I have spent days and weeks teaching myself how to use WP. My site has 16 pages so far and I have a horizontal navbar with 5 parent pages(I don’t want a sidebar and have chosen the one column design). I named the parent pages, ‘parent pages’ when I created them. I assigned the child pages to their parent page when I created them. I have created the custom menu and added all my pages and I have dragged all of my sub pages slightly to the right to make them subpages to their corresponding parent. I named my custom menu ‘dropdown menu’ and saved it. I have been trying to get it to function now for two weeks. Independent publisher supports 3 custom menus. I only want 1! I didn’t think I had to add code to my theme to make this function, but do I?
I am at a loss as to what else to try. Can you please help me from losing my mind? Thank you!