I am not the category monitor. I hate to see people shopping for cheese at a fishmonger's.
You posted an independent query on the "General" page; it is for general questions, like "What is a 'distant' cousin" and "How do I word a request to someone with my surname to see if we are related?"
(At least half the 38,000+ questions here on the General board are specific, so you are not the only one to make this mistake.
If you go to the post you saw and click on "Post Followup", your post will become part of what we call a thread. Also, usually, the person who posted will get an e-mail message telling him/her there is a followup.
In the post you saw, at the top, will be something like
Posted by: john_smith (ID *****1234)
If you click on that, you will usually get John Smith's e-mail address (some people hide theirs) and you can write to him/her directly.