[MM3-users] list admin via email

I'm unclear on how to approve via email a message sent to a list.

As list owner you receive a 'requires approval' email. It then says:

"If you reply to this message, keeping the Subject: header intact, Mailman will discard the held message. Do this if the message is spam. If you reply to this message and include an Approved: header with the list password in it, the message will be approved for posting to the list. The Approved: header can also appear in the first line of the body of the reply."

Question: if I want to approve the message, where do I "...include an Approved: header with the list password in it" ?

TY!