To confirm, are you referring to your custom URL? If yes, you can't change it after it's been created but you can remove it and claim a new one up to 3 times per year. More info here: https://yt.be/help/4moa . Hope this helps!
If you use the name/photo from your Google Account, you can update from here: https://aboutme.google.com . If you have a brand account, follow these instructions for editing your name: https://yt.be/help/JTg8