Network configuration issue on pmta

Hello, I bought udemy course on powermta ip rotation but I am stuck in the network config. The files I have in my network config its not the same as he one you showed in the video.

How do I add ip address in the ifcfg-eth0.

Here is a screenshot below

Run this command to add additional IP
ip addr add 85.43.343.34/32 dev eth0

thanks for the awesome information.