The main user of your company account can update the contact and billing information on the page "Company Information". You can navigate to the page from the drop down menu in the upper right corner.
The information can be updated on the "Overview" page by clicking the green pen icon. You can update the information in the same manner also on the pages "Basic details", "Contact details" and "Invoicing details".
If your company is Finnish, the postal address information can be updated for you automatically. For the automatic updates we use data from YTJ (www.ytj.fi). If you have a different address in YTJ, you can choose to update the information by yourself choosing the option "I want to keep my company’s address data up to date myself".