Please be aware, we've recently updated the CustomerHub layout so this video is a little out of date. We'll be releasing an update within a week or so with updated content and videos.
Inside of the video and documents any reference to the 'custom fields' menu is now 'profile builder'
Displaying Custom Fields in your Customers Profile is easy using the Customer Accounts Hub app. Watching the video below will demonstrate how to create custom fields and add them to your customers profile so you can start gathering critical information: