Code for Header Banner

Hello guys, hope you're having a good day, so basically I'm looking across the internet the correct code for putting my banner in the exact header position, and I can't find anything, so I hope that some of you can help me.. I put the image to show where I want my banner to be placed, could you please help ?

Thanks,
Best regards,
Martin

If it is a WP theme then look at the header widget.

Post the name of the theme and we should be able to help.

Thanks, I solved everything !