i have a tata photon plus connection but i can't do change ip address so any buddy know how to change this my ip address
You have an external IP and an internal one - which do want to change? If external - and you want a fixed IP for gaming rather than the static one your ISP provides, you need to ask them is they are capable of giving you one. Otherwise, you may have to go through a proxy and pay for one. If all you want is to change your internal IP address on one computer, you do that in the settings under the connections's Properties tab.