If you are happy with your registrar, there is no reason to transfer the domain registration to DreamHost; however, you will need to log in to the panel that your current registrar provides and change the DNS record to point the the DreamHost nameservers if you want the site to be hosted here. Once you have done that, it will take anywhere from 24-72 hours to propagate.
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Simon Jessey | Keystone Websites
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