How do I change the email address on a private account?

How to change the supplier contact for a purchase order (PO) that was sent to a private account?

Only your customer can change the email address on a private account. Please contact your customer directly to request an email address update, or ask them to submit the purchase order or trading relationship to your existing account without using a private one.

SAP Business Network for Procurement & Supply Chain > Administration (Buyer & Supplier Account Administration) > Link accounts
SAP Business Network for Procurement & Supply Chain > Transaction Documents > Transaction (Purchase Orders, Ship Notices & Goods Receipts)