Blogs 101: Some of my friends have mentioned that they couldn't figure out how to post a comment here. It's simple enough, but not too obvious, I admit.
Just click on the comments link (the one showing the number of comments left so far) below each article (e.g. "0 comments," "2 comments"). This will open up a pop-up window that displays the current comments and, when you scroll down, a place for you to add your own comment.
Oh, and your browser might not show updates automatically, so if you visit The World of Wombat and don't notice any new articles, try clicking the "Reload" button on your browser.
Hope this helps!