You will see numerous references to “sending commands to LISTSERV” in this and other L-Soft manuals. All LISTSERV commands are sent to the server either by email, or via the Web Interface described in Section 7.7 of the Site Manager's Manual, Submitting LISTSERV Commands. 

For mailed commands, this means that you must create a new email message using whatever command this requires for your mail client (click on “New message” or its equivalent for most mail clients) and address it to the LISTSERV command processor address, which is usually LISTSERV@ your server.

Let’s say for the sake of argument that the list you are managing is running on a server called LISTSERV.MYCORP.COM. In order to send a command via email to that server, you would create a new message and address it to LISTSERV@LISTSERV.MYCORP.COM, and place the command(s) in the body (not the subject) of the message.  Then send the email and wait for the response to come back.

Depending on how you have security set up for your lists, some or all commands may require that you validate them with a personal LISTSERV password, or by replying "OK" to a command confirmation request sent back to you in email.