How to Change public Ip Address
Public IP address is something like name given to your computer while you browse the internet. It is the address that is routed over the internet. So in order to maintain your privacy you might search for how to change your public IP address but it is not that easy. So you might use IP address other than yours to use internet but you can not change your pc's real IP address. This means you can virtually change your IP address to browse with privacy.
You will need proxy site to do this.
To prove it experimentally
go to whatismyipaddress.com through your browser and you will see your real ip address
Later go to whatismyipaddress.com using proxy sites above and you will see change in the ip address i.e the public ip address is changed.
Notice the change and Enjoy.