Adding the meter didn't turn out to be nearly as straightforward as I thought it would be. I've installed site meters before on web sites, and it's perfectly a perfectly straitforward cut-and-paste job there. What should have been a simple cut-and-paste project here turned into a semi-complicated debug (OK, at least it was semi-complicated for a self-taught moron like myself). For some reason, DearDiary's editor kept inserting breaks in the middle of the Java Script, which meant that the meter wouldn't run.
When I finally discovered what was wrong, it took me a while to figure out how to delete the breaks, since they wasn't anything I was inputing, but a gift from the editor after I hit submit. I've finally got the meter running in the Footer and on my Welcome page, but the trick isn't working on the Index page for some reason. I'll mess around with it some more when I get home.