The personal information (name, address, etc.) for any domain name owner is displayed by WHOIS services. joomla site strongly recommends that this information is kept up-to-date at all times.
If your domain is registered by joomla site you can update and edit your WHOIS domain information through your joomla site User Area -> My Accounts tab -> Domains section -> click on the Manage button for the corresponding domain name. On the new page you will be able to edit this information.
If you are a joomla site reseller, you can update and edit your WHOIS domain information through your joomla site Reseller area -> My accounts -> Additional services section (Additional domains) -> click on the Manage button for the corresponding domain name.
If you have a .ca domain, check our article about .ca domains whois change.
If your domain is not registered by joomla site you will need to contact your current registrar and request the change in your domain name WHOIS information.
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destination source:https://www.siteground.com/kb/how_to_change_domain_name_whois_name_address_etc_details_/