This help article will show you step by step how to switch a parent when the voucher has already been sent to the other parent.
Log in to your account and select view assigned vouchers.
Find the voucher you wish to swap the parents details on.
Please note: You can only swap the parent/send it to a different parent if the voucher has not yet been accessed.
Select switch parent.
Select the parent you wish the voucher to be sent to.
Press assign vouchers, this will send the voucher to the parent you have changed the voucher to be sent to.