Remove Header Image

Hello,

I've tried to insert a full-width slider in the frontpage to replace the header.
but there is still a header space and my slider looks like its in the 2nd page scroll down.
I tried to change the php based on the one you gave but still it doesn't work?
How do I remove the header image space?

Hi,
Could you please provide me with a URL to your website, either here or via PM (click the “Private Message” text underneath my avatar) so that I may analyze it?