How do I put spells into an NPC's inventory? I try to drag in the spells from the spells page but nothing happens.

1) Double-click on your NPCs name in the NPC list.
2) Cllick on the "Spells" tab.
3) Drag and drop the spells you want into that section. Make sure when you click once on the spell's name, that you get a red circle-and-slash symbol until you reach the Spells section. Sometimes when you click on the name it won't register.

Make sure Auto-Calculate is toggled Off, otherwise you cannot add new Spells.

Oh yeah, forgot about that.