Can I change my ip address manually and still connect to the internet?

Automatically it works fine, but if I change it I cannot connect.

There are two types of ip address we are using 1)Static ip address2)Dyamic ip address If you have dynamic IP, then change your IP address by following the steps:-1)Go to Start->Run->Cmd and Press Enter..Type in "ipconfig/release" for Current IP address and then type "ipconfig/renew" for New IP address.2)Either follow step 1 or Simply restart or unplug your modem/router .Doing either step 1 or 2 will change your Dynamic IP address. Visit Ip-details.com to check your IP address is changed or not