Just giving you a helping hand here as it appears you are new to HC, in that you don't need to start a new thread for every post you want to write. You only do that if you're completely changing the topic and there isn't already an appropriate thread back down the list somewhere that you could use
So, usually if you just want to make a comment to an ongoing thread just scroll down a bit below the post that just read and you'll see a blank area where it say's Write your message here. Or if you want to make a comment to someone’s actual post specifically just look over to the right-hand side of that post and you'll see a Tab called Reply with quote, click on that and type your message there and that poster will get notified that you replied to his/her post
