Hi,

If you want use post slider, please use  Featured Slider shortcode  then choose style you want( http://prntscr.com/m4yqxi )

Theme have  supported  28 featured slider.

Please check demo http://pennews.pencidesign.com/slider-style-1/

If you want use custom slider, please install and active Penci Slider plugin, then  go to Administration > Penci Slider, then create slider as screenshot  http://prntscr.com/m4ys0r

Demo : http://pennews.pencidesign.com/penci-slider/

Please check tutorial to know how to setup home page like demo 

Best Regards,

PenciDesign