If you know the domain name you can find out the ip address of the server it is hosted on. Then you can look up that ip and find out whose network it is in. Generally though the person that designed the site originally would know where it was hosted... contact them in the first instance as that will be the quickest way to find out how who does the hosting.
This site is quite good: www.dnsstuff.com/
Once you know where it was hosted you need to know the ftp username and password to upload new pages. Some sites have their own web based admin system so you wouldn't need to know anything but the admin username and password for it.
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