DW Trendy theme supports two menu locations: Top Menu and Primary Menu.

Look at the front-end, you will find the menus shown as below:

Menu Locations
Menu Locations

1. Primary Menu

After a menu is created, choose items like pages, and categories from the left column to add to the menu. Then select the menu that will be presented in the location such as Primary Location.

Primary Menu Settings
Primary Menu Settings

2. Top Menu

Once added successfully the menu, make sure that you checked Top Menu as shown below:

Top Menu Settings
Top Menu Settings

To the menus display properly, go to Appearance >> Customize >> Navigation, select which menu appears in each location.

Settings of Menus
Back-end Settings