Go to Contacts, then search for the email address of the contact you wish to associate an account with. Once you have the contact, click on the edit icon.
2. After clicking on the edit icon, you will see the page below. You can add the sub accounts in the Accounts field. Once done, click on Update.
If you run into some errors, please contact us so we can help fix them for you. You may send an email to email@example.com.