Hi Dona,
Thanks a lot for helping us out. I hope you know that we are based in Kathmandu, Nepal. Thanks…
About the header image that you are taking about. Yes, you can either disable that Header Image on that page or Change it as per your need.
A. Disable header image in particular page:
1. Just edit that page and then below your page editor you will see “Catch Kathmandu Options” meta box like this https://www.pinterest.com/pin/548594798331765450/.
2. Just like wensolutions answered it you can click on “Disable” in Header Featured Image Options.
A. Replace header image in particular page:
1. Just edit that page and add featured image. For featured image refer to http://catchthemes.com/blog/videos-blog/video-series-adding-featured-image-wordpress-postpage/
2. Go to “Appearance => Theme Options => Header Featured Image Options” and select “Entire Site, Page/Post Featured Image” in “Enable Featured Header Image” options
3. Finally, Save Changes. This will replace your default header image with the featured image of post/page that you have featured image.