To make a drop down menu, follow these steps. 

Step1. Create a new page for your website by clicking on file>new or the new page icon in the page editor view. 

Step 2. Specify the new page as a sub page by clicking the check box labeled "Make into sub page"

Step 3. Choose the main page you would like the sub page to be displayed under. 

Step 4. Click the button labeled "Create Page". 

Step 5. You can change the order of your sub pages from the dashboard view.