Hi Surbhi,
Sorry to delay, but you can add only text in place of logo in free lite theme.
To add logo you need to purchase theme, please check bellow link
https://www.themescave.com/themes/wordpress-theme-multipurpose-business-cover-pro/
you can check our documentations link
https://www.themescave.com/documentation/business-cover/
Thanks
ThemesCave
