If you want to change your local address, you can via your network adapter settings > Properties > Internet protocol version 4 > Use Static
But your ISP address cannot be changed unless its through them.
.Do note that if you want to use a custom IP, Make sure the config you do matches up with whatever network device you are on. (Router, Switch, etc.) Otherwise you will be most likely disconnected, don't worry, If it gets messed up, just switch the statics back to the "Obtain IP address automatically" setting where you changed your IP.