It is very important to keep the contact details of your account up to date. You can modify the account contact details by following the instructions below:

1. Log into your account and click the 'Account' button at the top of the screen.

2. Click 'Account Contacts', located on the right-hand side.

3. Update the contact information that you wish to change, and use the tab to navigate the 4 different fields: registrant, administrative, billing and technical. Alternatively you can also check the box "Make all contact information the same as Registrant" to make all the information the same in all 4 fields'

Note, these are the contact details that will be applied to domains registered from within your account. If you need to change the contact details of a specific domain, you can follow the instructions here.