How to Change the Slider revolution default dimensions?

Hi,
Yesterday I purchased this theme pro. I am getting the problem with slider revolution(SR).
I would like to change SR for my needs. When I change background image size, it is fitting in the default dimensions. If change my image dimensions, I am getting the space below the slider. I need remove the space or change default SR dimensions.
One more issue, How to activate slider because it showing only one slide.
Please check this website.
https://www.pay2wood.com/
Please solve this issue as soon as possible.