shelley-
I logged into your account and took a quick look, I think you are just using the wrong screen.
Under Customer Center > Customer List you are using a screen called Customer List - Admin Sales (You can see this by hovering over the tab link name).
Looking at the your most recently customized screen Customer List - Shelley, I can see that it has the changes you are looking for.
You will either need to make the changes to Customer List - Admin Sales or update the tab link to point to Customer List - Shelley.
-Michael