problems with Homepage testimonial settings and main slider after upgrade

after upgrading the theme to the newest version I have two problems in home page.
I am not able to change the dimension of the image in the main slider (I would prefer to have a lower image).
I am also not able to remove Testimonials in homepage.
Thank you for your reply.
I am using the free version of the theme

The page I need help with: [log in to see the link]