1. Login to your website wp admin dashboard, e.g.,https://greyboxprod.wpengine.com/wp-admin/
2. Click on ‘Templates > Theme Builder’ in the left-hand side menu
3. On the left-hand side you will see the ‘SITE PARTS’, click on ‘Header’ and header section box will appear.
4. Click ‘Edit’ for the main menu header template on the right-hand side.
5. Right-click and select ‘Edit Menu’ to display the settings on the left-hand side.
6. Select a menu on the settings.
7. On the bottom left-hand corner of your screen click the ‘UPDATE’ button to save the changes made.