1. firstly i don’t know where you want to put those slider. either on home page or where. if you mean home page http://jobplanet.jegtheme.com , you will find it hard to change the page with real slider. you will only able to change background slider and i personally think its kind of weird.
2. to change hero header you can find it on jobplanet themes folder > header-page.php
we use this file to showing header that you use on page. i don’t know, but you can try revolution slider because it have option for creating responsive slider that might fit with your need.