You can't change a custom URL after creation. However, you can remove the custom URL from your channel and claim a new one if you want to change it. Note that once you remove a custom URL it may become free to be claimed by another creator.
@TeamYouTube would it be possible to change my channel url permanently?
Same channel, new url
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That's great! How about the non-custom URL? Like the random string of letters and numbers after http://YouTube.com/channel/ ?
End of conversation
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