Posting the thank yous for freebies etc

[sagitarian57]

I'm sure this is a silly question, but I can pretty much figure out most of this site Except how to post a "thank you" I have that trouble on almost every scrapbooking site on the web. Sooo please someone, take me through the thing step by step as if I were in kindergarten. So many times I want to show my gratitude but can't figure out how to post. I wonder how many others don't say thank you for that very same reason. I'm older than dirt, so be gentle. Thanks Andi