Hi again.
1. Fort the portfolio image, please go to Dashboard/ portfolio/ and change the portfolio data as you want.
http://nichegroup.in/wp-admin/edit.php?post_type=yolo_portfolio
2. For the banner image, please edit home page/ edit Yolo banner shortcode and change another image as you want as this: https://prnt.sc/q5f1vg
3. For the creative section, you need to select another product for Yolo single product shortcode as this: https://prnt.sc/q5f2mt
Please try it again.
Thanks.