Sorry, I completly forgot about that question:
As I read it, if you can't smite, you gain up to 3 smite per day. If you can already smite, you only gain an extra smite at level 2 and one at level 7. I don't want to make it too complicated to track and all, so here how it will work:
You gain an extra smite per day at level 2, 6 and 10. Your level of Pious Templar stack with the one as a paladin to determine the bonus damage of your smite (so at your level, you can smite once per day, at +4 damage. Next level, if you take Pious Templar, you'll smite 2/day at +5 damage, ect...)