making the server ip a domain name

[ehcpuser]

How would I make it so that my server ip is a domain name instead of the ip. For example if my server ip was 12.45.678.89. How could i change it so that it's http://mydomain.com/vhosts/ehcp/?
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[ehcpdeveloper]

go to easy install scripts,
choose "ehcp itself",
install onto wherever you want.

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