How to add banner images in theme child pages

Hi,
I like this templates its working fine.I have a doubt in this theme .i have installed a job manager plugin in this template .its working greatly .my need is to add different banners on plugins child pages .(plugin generated pages)its not showing its page id’s or name .so i just want to add particular images on its child pages.could anyone help me to solve my problem.

my website in local mechine so i cant give the Link
https://wordpress.org/support

Thanks in advance. Hope i can get replay as soon as fast.

Regards,
Sachin