Menu needs the pages, posts, and categories so please create that first if you haven’t.
- Go to Dashboard > Appearance > Menus.
- Click on Create a new menu link.
- Enter the menu name at “Menu Name” field.
- Select the pages/posts/ categories and custom links tab from the left side.
- Drag-and-drop the selected tabs as you like.
- Choose your display location for the menu.
- Click on Create menu button.