Ver la ayuda ayuda valga la redurbnebnrenbnancia:
"Frequently Asked Question
How do I change my hi5 URL?
Once you select and save your hi5 URL, you won't be able to change or delete it. Be sure to choose carefully! "
O sea que una vez la creas no hay manera. Siempre puedes abrir una nueva cuenta.
Saludos,
Javi.