Welcome to ExplainXKCD wiki. In response to your recent post, at the top of each article, there is a tab on the left for "Page" and another for "Discussion". The discussion link may be red because there has not yet been any discussion, but that's where you'd put any discussion and comments. You can add a header by surrounding it with double equals signs ==like this== - the header "discussion" for this post was done this way. The more equals signs, the deeper the header (===this=== will be a subtopic of ==that==, assuming this comes after that on the page.