Help with autoplay

Hello,

I bought a template and there is a full screen image slider in het background. I want to set this to autoplay, but i don't know which js file i need to edit en what i have to edit.

http://templates.bigwebmaster.com/demo/41194/1.html

The autoplay should be like 5 seconds for instance.

Can somebody help me with this? i can send all the files you need.

Best regards