How do i change my username?

I'm trying to change my username on my youtube channel from my full name to a nickname but every time I try do to this is goes to my google profile. I've tried unlinking my channel from google and then it changes its name to my url which I don't like. How do I change it because I am fully stuck and... show more I'm trying to change my username on my youtube channel from my full name to a nickname but every time I try do to this is goes to my google profile. I've tried unlinking my channel from google and then it changes its name to my url which I don't like.
How do I change it because I am fully stuck and none of the answers I've looked at are working?
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