To post a message into a specific thread, simply 'reply' to the
message within the thread you want to address.
If you are the first visitor to post a comment into a pre-existing
thread, you will need to 'Forward' your response to the group email
address, using the thread title as the Subject line. For example, if
you are the first poster in the topic "HelmCoP", Select the 'Forward'
link from the first message, enter as the 'To:' address:
nematode...@googlegroups.com
and in the subject line type:
HelmCoP
Thanks,
John Martin