I’ve been tinkering with this – you can upload replacement images to wp-content/themes/minamaze/images/slideshow
They should be 1500 x 350 (although I don’t know why they need to be that big, they only appear small. The slider images are the same size and can be uploaded to the same place).
I’m trying to figure out where to go to change the “Read More” button and the text that precedes it. Any ideas? This really is a terribly unfriendly theme.