I wanted to add a signature to the bottom of every post, and it seemed the way to do this was to use a plugin. However, my WordPress dashboard doesn’t have a “Plugins” menu item, which should be below “Appearance” according to the help pages and various screenshots you’ll find when googling.
It turns out that blogs hosted at wordpress.com don’t support plugins, presumably because installing a plugin involves uploading files to the server, and it’s not your server.
tentacles666 