Domain is private but need to change email address

[info7]

My domains are PRIVATE but I need to change where the emails are initially sent (such as the xxxx.org@domainsbyproxy.com below) This is the statement when managing the domain ---

We’re taking email sent to xxxxx.org@domainsbyproxy.com and delivering it to yyyyy@yahoo.com.

How do I change the initial email? The email that its being forwarded to is fine.

[Nate · Accepted solution]

You can not change the @domainsbyproxy.com email address.  This would simply be prepended with the private domain in question.