To edit your Navigation Menu / Header. Click Appearance on your WordPress Dashboard and click Menus
To change the label of a menu, click the dropdown arrow of the menu item you want to edit. Change the label of the menu item.
To add a new menu item to the navigation header, select an item on the left panel. Click the checkbox of the item you want to add and click Add to Menu.
To change the order of your menu items, drag the menu items and arrange them to your preferred order.
If you want an item to be on a dropdown menu, drag it under another menu item. For example: Our Programs has 3 sub-menus (Church Planting, Youth Mobilization, and Spiritual Formation).
Click Save Menu to save your changees