You need to have a DNS entry which resolves your www.poi..
. to your IP address, this should be done for you when you register your URL.
You could add an entry to your hosts file ( have a look at http://en.wikipedia.org/wiki/Hosts_(file
) ) which would have to be put on every computer that you want to use your local web site. But remember to remove this entry once your proper site is working, otherwise they will continue to try and use your local site.