In Avatar: Legends of the arena you just need to click on your name to change it. I am not sure about THAT OTHER webgame sorry.
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No, but you can change the capitalisation, for example; If your name is 'username', you could change it to something like 'UsErNaMe'.
You can't change your username on YouTube, though you may create a second account with a new name.
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Once you create a YouTube username, you will not be able to change it. However, if you were affected by the Google+ to YouTube name change, you should be able to edit your preferences for the name displayed in your account settings.
go to runescape.com homepage and look around it said forgot your password type your username and it will tell you your password.