If you have a new YouTube channel, even though you can put a descriptive name to it like; MyWonderfulChannel, when you go to share it on social media it becomes youtube dot com/c/ei3uir8uerie. This is totally unreadable and no one will remember it.
This is what you will see when you try to change your channel name with less than 100 subscribers.
When you reach 100 subscribers, you will be eligible to put a custom name on your YouTube channel URL, like .../c/MyWonderfulChannel. That will not only be easy to share but also easy for your audience to remember.
This is what you should see after you reach 100 subscribers. Bear in mind that sometimes it takes a few days for it to change from the above image.
Next, we will briefly look at what goes into a name.