You must have Admin Level - Webmaster access to add custom fields.
NOTE: Once this field is set, please do not change it. If it's changed, the account user-defined field for ALL accounts will update to the new name.
Go to Business Tools > Org Profile & Settings.
Scroll down to the Display Member Ages Section.
Enter the custom name in the “Account/Member Custom Field Label” field, such as the Club Account Number.
Click Save.
Registration Setup
Within the Settings of Class Admin, you can now set that field to Show but Optional, Show and Required, or Hide. The chosen setting is enforced during the account registration.
Account/Member Admin
When Accounts sign in to their account from My Account, they can update the user-defined field, but this field is not enforced within Account/Member Admin.
How to Print from Account/Member Admin
Go to System Admin > Account/Member Admin.
Choose either the Accounts or Members tab.
Select one or all.
Click the Excel button.
Custom field values are listed in their own column.