You can't be able to change a custom URL once it's created. However, you can remove the custom URL from your channel and claim a new one if you want to change it. Find more info here: https://goo.gl/KgWvEa . Hope this info helps.
@TeamYouTube Hey Youtube, when I was younger and I made an account, I chose a really stupid Custom URL. Can I change it to something else, or is that the only URL I can have for my channel forever?pic.twitter.com/M56q6euC9z
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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