How do you change odometer numbers?

They may be because I've never done this. They are lined up at the top of the number opening and the other end is on the bottom. (There are two metal slots - one on each end of the tab). I had all the numbers at 0 including the tenths and turned where the cable hooks up until it got to 1 mile...it seems to be working o.k. but now you've got me a little concerned...