The whois contact details of a domain can be updated by following the instructions below:
1. Log into your Name.com account and click the 'Account' button at the top of the screen and selecting 'My Domains' from the drop down
2. Click the domain you wish to update
3. Click 'Contacts' to the left of the screen. Then update the information you wish to change in respective field and click the 'Update' button at the bottom left of the screen. To have all the information changed in one move, simply check the box for "Make all contact information the same as Registrant."
You will then be asked to validate the update by entering a PIN. You can choose to have the PIN emailed to you or via telephone. See screenshot below:
Once you have the PIN, enter it into the 'Verification Code:' field on the popup and click 'Verify. See screenshot below:
Once you have done this, it may take a few hours for the changes to fully propagate throughout the internet.