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

so i have 4 levels in to assasin atm but everytime i cast 2nd level assasin spells it jsut comes up as darkness instead of cats grace is there way to change this? i do have a ranger spell book do i have to do soemthing to swicth the out? have 14 int if it matters

right click the icon i think, it will show you list its kinda of annoying

Put them on your hotbar, then click on them and you ll get to choose which spell to cast