Spell Numbers

[Makinus]

I´m creating a mod where i will change a lot of spells, making Battle spells that need gems to be gemless (but with higher magic path requirements) but i´m having problems by modding them by the spell names as i keep getting errors that there is not spells with such names..... according to the mod manual you can mod them with spell numbers too, but where do i find these spell numbers?

Thanks.