The hosted domains feature of a hosting account refers to the amount of registered domains which you could add within the very same account. Registering a domain and hosting it are 2 different services although a lot of people consider them to be the same thing. While the registration means you become the owner of a specific domain, the hosting element is what really allows you to have a web site as this is where your data and email messages are going to be. As these are two separate services, you can register a new domain name with one company and host it with another by modifying its name servers (DNS) - the domain shall work in the exact same way as if it was registered and hosted using the same company. Additionally, it is very important to know that changing the hosting means directing the domain address to a different company and not transferring it.