how to setup multiple domains for one website?

Setting Up a Domain Alias
To set up a domain alias:

On your Home page, click the domain name for which you wish to set up additional domain names.
Click the Domain Aliases icon.
Click the Add Domain Alias icon.
Type the desired domain alias name, for example alias.com.
Domain aliases can comprise letters, digits and hyphens. Each part of the domain alias between dots should not be longer than 63 symbols.

Select the Synchronize DNS zone with the primary domain check box if you want the domain alias to use the same DNS zone resource records as in primary domain. With this setting, any subsequent changes in resource records of the primary domain's zone will be applied to the DNS zone of this domain alias.
Select the Mail check box, if you want e-mail directed at the e-mail addresses under the domain alias to be redirected to the e-mail addresses under your original domain name.
Example: You have an e-mail address mail@yourdomain.com. You have set up an alias for your domain name, for example, alias.com. If you want to receive mail to your mailbox mail@yourdomain.com when it is sent to mail@alias.com, select the Mail check box.

Select the Web check box. Otherwise, the web server will not serve the web content to users coming to your site by typing the domain alias in their browsers.
Select the Java Web applications check box if you have Java applications installed on your site and you want them to be accessible through the domain alias.
Click OK.

but I can't find the domain aliases icon. Crying or Very sad

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