Most domain name types (TLDs) that we register offer the option to change these contact details.
You can do that from the Registered Domains section (My Domains > Registered Domains) of your Control Panel.
OPTION 1:
In the table of registered domains, search for the ‘eye’ icon ( ) in the Edit DNS/Whois column pertaining to the domain the Whois data of which you want to edit.
Click on the icon and you will be forwarded to a form where you can input new contact information for each section – registrant, billing, administrative and technical.
Once you fill out the registrant section, and if you want to use the same contact information for all the other sections, there is an option to copy the same information in the other sections as well.
As soon as you are ready with all the changes in all the sections of the WHOIS record, simply press the Save Information button at the bottom of the page and that will update the WHOIS record for you.
You should see a message The details have been modified successfully! to confirm that.
Please have in mind that WHOIS changes may require up to 24 hours to update worldwide.
OPTION 2:
Tick the checkbox next to the domain that you want to edit, then click on the “Change WHOIS” button that is located just above the domains.
Then follow the edit-Whois steps as described in Option 1 above:

Through this option, you can also edit the Whois data of multiple domains at a time.
NOTE: Keep in mind that the contact details of some TLDs (.co.uk, .org.uk, .me.uk, .ca, .eu, .be, .at). cannot be changed.
Others require a manual change, so if you encounter any error message, you can contact us by opening a ticket from Help Center -> Open Support Ticket in the top-right corner of your Control Panel or the button below.
Please be informed that the WHOIS record is public and anyone on the web can look up the WHOIS record of any domain name that is currently registered. This exposes your personal contact details, incl. name, address, etc. to the public. If you want to purchase the WHOIS ID protection service that helps hide your personal data and protect it from malicious use such as spam emails and telemarketing, please refer to the Understanding Domain Name WHOIS Privacy Protection article.
Have in mind that providing false contact information in the WHOIS record is considered illegal and may result in cancellation of the domain registration. Therefore that is not an alternative to the WHOIS ID protection service.