Ssh via KVM and type this command

nano /etc/sysconfig/network-scripts/ifcfg-eth0
You Will get this output

TYPE=Ethernet
DEVICE=eth0
BOOTPROTO=
IPADDR=85.17.26.xx
NETMASK=255.255.255.0
USERCTL=yes
IPV6INIT=no
PEERDNS=yes
ONBOOT=yes
Remove your present IP and add the new one .

Press ctrl+O (Same the file) and ctrl+x ( to exit)

Then type this command in root

service network restart
You are ready to use your new IP .




Edit: You will need the Gateway to add the new IP, ask them for your gateway also