[Plugin: Related Posts Slider] Slider Arrow Doesn't Work

Hello, I just installed this plugin and am in the process of setting it up.

When I set it up the right arrow doesn’t work. It does not move the related posts to show more.

The left arrow does move the slider and show previous related posts.

Any idea on what could be happening?

Check it on this link.

http://ww.wp.xz.cn/extend/plugins/related-posts-slider/