Remove Mod_Pagespeed

I was install with your suggestion mod page speed on whm But now page speed module giving a warning " ModPagespeed Generated File Prefix is deprecated please remove configuration" and my pagespeed.conf is empty when try to edit it through comand nano /etc/httpd/conf.d/pagespeed.conf it showing error file is not avialable so what can i do in this situation actuuly i have to add filter lazy load for my site through the mod page speed module.is there any option to remove mod page speed module and install with fress module on whm with centos 5 32 bit with apache 2.27. I have installed mod page speed Customized module from the bellow reference link