How to add header images (100% width)

Hello everybody,

I´m about to create a Website (www.restartlife/restartlife) with Gavick Creativity. I tried a lot but I have no clue how to add such header pictures as you can see here: https://demo.gavick.com/joomla25/creativity/ (the picture below the menu where "blog/article" is written in). What seetings are needed?

Thanks a lot!
Greetings from Austria
Mia

HI

Unfortunately I could not check Your site, since You are not using our template anymore, but I'm guessing problem was because of a missing page class suffix "onepage", which has to be added for a frontpage in template configuration.