Your username on Tellie serves as your custom URL. So if your username is grace-jones, your Tellie vanity URL would be tell.ie/grace-jones.
You can easily change your username by going to the Profile section of your Dashboard. https://tell.ie/dashboard/profile
Type a new username into the text field and if it's available you can claim it by clicking "Save" at the bottom of the sidebar.
🚨 Note: changing your username affects all of your links. If you've previously shared your profile or any page links on social with your old username, those links will no longer work.