Niki,
No need to be sorry! Because of the sheer number of daily threads (they call them "condos" on this forum) that are created here every day, there are certain "conventions" that are encouraged when you post on the Tight Regulation forum.
Like "one condo per cat, per day", for instance. It just helps because it keeps all your "stuff" and all your questions, in one place. It makes it easier for anyone just "meeting you" to see everything at once. It also makes it easier for you down the road, because you can go back to the earlier days' condos and find what you are looking for more simply.
And like "updating the subject line". That helps by putting the most recent information on the index page so that if you have a new question, or you just saw a strange high or low number from a test, then you can update the subject so that everyone sees that you need help or advice "now".
But you're the "new kid on the block" this week. You aren't expected to know everything about the forum specific guidelines when you first start posting here. In a short time, you'll get the hang of things, so don't worry too much about it!
If you have any questions about "how do I update the subject", or anything about "how-to post", just ask away and we'll try to help you understand. But you don't get "demerits" if you don't quite get things right. ;-)
Carl