Baldur's Gate : The Sword Coast Chronicles : NWN2 Persistent World

So, I am playing a Blood Magus, and I'm trying to figure out how to use some of the abilities such as the Scarification feat.

You drag the Scarification feat on your hotbar. You activate. You cast the spells that you want to have as scars ( 1 per level ). The scars appear in your inventory, which you use in a similar way to scrolls. Dont forget to deactivate scarification