Over to the right, you’ll see two drop-down selection boxes for month and year. In theory, once you select two values, you’ll be transported to the posts from that period. You won’t be transported anywhere unless two values are selected. If no posts exist for the month you chose, you’ll have to use your back button.
Let there be joy and celebration. Let jubilation reign.
(Yes, I know 2006 hasn’t happened yet. And you’ll find that there’s maybe, like, one post for each of 2001 through 2003. In fact, I can’t remember if there actually is a post in 2003, since I didn’t restore all the old posts after the Great Server Crash of 2004. So have fun.)