You don't have a password enabled. Neither do I.
So, when I go to "screen and Lock" app, tap secure unlock, choose password, I see a text field to first ENTER, then a second text field to CONFIRM password.
First put in your new PW, then tap the second text field (where it says confirm password) and re-enter to confirm that.
if you already had a PW set, under secure unlock you would see the choice to CHANGE PASSWORD. WHICH YOU DON'T.
Phone and TP is the same GUI. It's a little confusing because the second box does not appear until you fill the first field then tap the words "confirm password". just type it in once, tap below it and type it in again. It will work.