Log Into the Gmail account that you registered it in. Then ( if you haven't Deleted the email ) You should find the username in there.. Or If you go to youtube, and click the * Forgot my username * Button then It should send you an Email with your login details! :)
You can't. Youtube only lets you put letters and numbers in your username.
YouTube username is always your original name. The Gmail username is the ID which is used to log in. Then it is your name that shows up.
just the username. not the password
No.
Alex Day's YouTube username is Alex Day. He previously used the username nerimon.
Here are some ideas: beautypop LifeOfGlam makeupblitz
pinkpuppies4u pinkpuppies hushpup
osnapitzari
JedwardTV
You go to background and make a background with your username on it using a program such as "Paint" for PC's.
You can't change your username on YouTube, though you may create a second account with a new name.