Having only one image on slider to use as banner

Hi. Great theme but I really don’t want four slides. In fact I only want one – simply a static image to use as a header. When I downloaded it I didn’t realise that it was a slide show – I only want a header but it seems impossible to get a responsive theme that provides enough space for a significant header. Thanks. I’ve been banging away at this for hours and I’m crosseyed!!