Impundulu familiar for Witch
 

At level 9, I chose an Impundulu as a familiar. On the Familiar sheet, it shows a specials, it shows witchcraft, saying that when the witch bonds with the familiar, the witch gains a patron theme (Agility, Elemental or Transmutation). On the main character sheet, I'm not seeing how to add the patron theme to get the extra spells. I can add a second Patron, but it now fails validation. Anyone know how to do this or can point out what I'm missing to set this up?