Change a Domain Name:
Domain names can’t be changed once they’re registered.
If you misspelled or otherwise need to change a domain, you can cancel it within the 96-hour cancellation window. From there, you can register a new, correct domain name for your site through your domains page.
If you purchased domain mapping and misspelled your domain during this process, you can cancel and refund within 30 days.
Outside of that window, please contact support.