Your site uses multiple WordPress menus. To edit go to: Appearance > Menus > then on the main page use the dropdown option to select the menu of choice to edit.
You can edit the items in each menu by:
- Choose items from the left (or create a custom url).
- Drag & Drop to 'add' them to the menu area.
- Edit 'Navigation Title' or menu item 'ULR' if needed.
- *Save your work to see the change on your live website.