If you haven't set up a custom channel URL yet, this is what the standard URL looks like: youtube.com/channel/UCL9W2iQrz6CAb3JWd9rweXw
It uses your unique channel ID, which is the numbers and letters at the end of the URL
To be eligible for the creation of a custom URL, your account needs to have 100 or more subscribers, be at least 30 days old, have an uploaded profile picture and banner.
Set up a custom URL for your channel
Sign in to YouTube Studio.
From the left Menu, select Customization > Basic info.
Under Channel URL, click Set a custom URL for your channel.
In the box, you'll see your custom URL. You can add extra letters or numbers to make your custom URL unique.
Click PUBLISH, then Click CONFIRM to confirm your custom URL.
Example of a custom URL: youtube.com/channel/EnfinityMCN
Note: Once a custom URL has been set up, you can't change it or transfer the URL to someone else.