Hmm, if your channel meets the eligibility criteria for a custom URL, follow the steps here: https://yt.be/help/4moa . In case you encounter an error while performing the steps. share a screenshot showing the error message. Keep us posted.
@TeamYouTube
can I request a change to my custom url? it’s only been changed once, but that was years ago...I tried changing it recently but the site won’t allow me to change it...please help 
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Well when I tried changing it before, google+ was still a thing, but that shouldn’t matter because I had to change it from my about me page...but it kept telling me I couldn’t do that.. now it doesn’t give me an option for a custom url anymore...
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