How to Change youtube URL || youtube Username

My Web page : <br />http://sourab44.weebly.com/ <br /> <br />Facebook page: <br />https://www.facebook.com/sourabhossai... <br /> <br />Twitter : https://twitter.com/sourab44 <br /> <br />Google Plus : <br />https://plus.google.com/u/0/+SOURAB44... <br /> <br />Linked in: http://bd.linkedin.com/in/SOURAB44 <br /> <br />To get your custom URL: <br />Sign in to YouTube and navigate to your advanced account settings. <br />In the Channel settings area, look for the notice to claim your custom URL and click the included link. <br />You'll be redirected to claim a custom URL. <br />You'll see the custom URL(s) you've been approved for.