I trust you are well,
This option may be possible if your email has not passed any data on the, however, if data is passed you will need to register a new domain name.
Please send a ticket to firstname.lastname@example.org with your primary email address (the one you signed up with) and we will be able to change your account username for you.
If you require further assistance,
please send a message to our WhatsApp helpline: https://whatsapp.afrihost.com
or visit our Help Centre: https://help.afrihost.com/
or see our FAQ page: http://faq.afrihost.com