If you're not using the HTTPS Everywhere add-on, then typing https://dreamwidth.org into the address bar (or bookmarking it, then clicking from there) will take you the secure (encrypted) connection, so every page you visit on Dreamwidth from there should be secure (I say "should" only because there are a smattering of links that got missed in our last codepush to make all links support https://, but most of them just convert to the more secure connection automatically, as they should).