Those details you can remove under Theme options > Header & Subheader > Subheader section but as we can see, you probably do not mean to remove it completely but just hide the text to keep the background. If that's what you mean, you need to use custom css:
Comments
it's because you use kind of transparent header. If you don't like it, please use different header type.
Thanks!
#Subheader .title, #Subheader .breadcrumbs { visibility: hidden !important; }