To modify an existing page go to Pages and select the desired item.
To create or modify a main Menu item go to Pages and create/modify the desired page, then go to Appearance -> Menus and associate that page to the Main Menu.
To modify an existing page go to Pages and select the desired item.
To create or modify a main Menu item go to Pages and create/modify the desired page, then go to Appearance -> Menus and associate that page to the Main Menu.