This domain is named for the surname Duniho. If your surname is Duniho, and you would like to use a subdomain of the form your-first-name.duniho.org, please contact Fergus Duniho. I am not offering webspace to host an account. There are many places you can get that on your own. Assuming you already have your own website or page, I am able to create a DNS record that points your own *.duniho.org subdomain to it. I can create an A record to your IP address, a CNAME record to your canonical domain, or forward the subdomain to a particular URL.
DNS services are provided through Free DNS.