You need to put your "Thank you" message at the bottom of the original question Val. That way, everyone who has answered will get a notification that there's something else to read and will see it. No-one has a clue who you're thanking for what if you just post your message as an "orphan" with no context.

Go to your question and write in the box at the bottom of the string of comments, then click on "add comment" and it will be there with your question and all the answers.