Follow these steps on G2G to find the account email for the form on the main page.
1. Click your profile icon in the top-right corner, then select Purchase Orders from the menu.
2. Open the Delivering or Completed tab, then tap your order to open it.
3. On the order page, scroll to Purchased Accounts and tap Accounts #1 (or the account button shown for your order).
4. Find Account Email and tap the copy icon next to it. Paste the email into the form on the main page.