You change it through Google+, which is Google's version of Facebook. You just have to go to your channel, and then try to change your pfp, which will direct you to the page it is on. Close the prompt to change your pfp, and then change your name through there. There are also plenty of tutorials on YouTube from back when Google+ was just implemented.Hi. While on the topic wanting to change my username, what is the easiest way to do this? And will it affect my subscribers or anything like that?