I have a question plz, my domain was expired and I saw here you have the possibility to take one for free, I have added, but I don’t know how to transfer from the old domain to this new one.
The free subdomains are free indeed. This doesn’t include your own subdomains however. Make sure to get a subdomain under our domains rather than your own expired domain.
If someone offers you a free subdomain, they can only give you subdomains of domains that they already own and are willing to give you subdomains of. You can’t just enter any domain name and get a free subdomain from it.
After all, it wouldn’t be good if you could just get <yourname>.apple.com as a subdomain for free by just entering it in a field.