In this thread, How do I pronounce the name "Aurelius"?, I followed up a suggestion to continue the discussion in chat, and posted my comment here: http://chat.stackexchange.com/rooms/18444/discussion-between-tunny-and-fumblefingers. Two people have now posted comments there, but I cannot. In the place at the bottom of the page where I imagine I should be able to write my post is the apparently irremovable message:"You must have 20 reputation on The Stack Exchange Network to talk here. See the faq. " I have followed up a suggestion from Matt to log in to the chatroom, following a link provided by him, and also clicked on everything I could see on the chat page, but I am still unable to post anything.