Here is a simple 1-minute guide to help you make changes to your Whois contact details.
Step 1 – Login to your Control Panel
Step 2 – Under ‘Manage Orders’, click on ‘List/Search orders’
Step 3 – Click on the domain name whose contact details you wish to update.
Step 3 – Click on ‘Contact Details’ which is at the top left of the webpage. This will enable you to view and edit your Registrant, Administrative, Billing, and Technical contact details.
Step 4 – Select the contact details you wish to update and click on ‘Save Contact Details’
Knowledgebase link – https://manage.resellerclub.com/kb/servlet/KBServlet/faq452.html
You can watch this video also at the source.