Hi, Martha. I'm looking at this on an Android smartphone, so it might appear slightly differently on your device or computer, but when i touched the Reply link under your original message, a form opened for me to type my reply. Underneath, there are three buttons: Reply to Group & Sender, Discard, and Private. That third option should send your reply to the original poster only.
Deborah Blankenberg (JewishGen ID #613395)
Researching BLOCH/BLOCK (Germany to New York, Colombia and Missouri), BLINDER (Kishinev to New York via Poland? and Paris), KUSHER/KUSZER (Lodz vicinity to New York via Paris), GOLDSCHMIDT (Germany)