You cannot change the public IP address.
to change the local IP address----
click on start..run..type cmd...click on ok
type ipconfig /all and press enter
write down the IP address
subnet mast
gateway address
DNS1
DNS2
right click over my network places
click on properties
right click over local area connection
click on properties.
click "Internet protocal( TCP/IP)" from the list and click on properties.
choose " Use the following IP:
Here is where you change the local IP address.
Bare in mind you have to stay in the same subnet/network.
E.g: if the IP address you write down is 192.168.1.102
You can only change it to: 192.168.1.2 to 254
The rest of the information stays the same...subnet mask, gateway..and the 2 DNS. Good luck