How do I add a dropdown menu within a page?

I am looking to make a drop-down menu WITHIN a page that will go to different pages when selected. I would like to be able to name them, etc.

Currently I am designing a medical website for a client of ours who wants this functionality. I found a theme that will sort of do this but it’s not working very well.

Examples of what they want:

The “I want to..” dropdown at the top of the page,

Here is what I have so far:

The theme is setup so that I have to create pages for the first drop down, then another child-page for the 2nd drop down. Number one it’s not working and sits there loading, and number two I just want to make it more simple.

Any ideas? I have not found a plugin that has a simple drop-down style shortcode I can create.