I finally got it onto the sidebar. Or I guess at the bottom if you're looking at it on a phone. See, right there below the search box. It's provided by the follow.it service. Just enter an email address and click "Subscribe." And read this for more information about what happens after that.
I've wanted to do this for a long time, and even more since I quite doing the Sunday Night Journal and posting became more irregular. Too bad I didn't have it back before Facebook and Twitter took the place that blogs had for a while early in this century.