how can i lock this thread
Fun guess the picture word game thread 5.0
Check your other thread, I left you two links. Otherwise all you can do is just let the thread fade into oblivion by not posting in it.
I just unblocked you. Please feel welcome to rejoin the games, just do not spam them! If you want to ask multiple questions after you've already posted a few comments, pick the last comment you made and edit it to add your queries. 
You can post in the forums and create threads, right? So go to the Help & Support forum, create a new thread with a title like "Requesting Moderator to delete my thread in Off Topic" and in the contents provide the link to the thread, http://www.chess.com/forum/view/off-topic/fun-guess-the-picture-word-game-thread-50?page=1
Go here: https://support.chess.com/
Very upper right corner click "Contact" and fill out the form.