Changing necromancy secondary skill to 5%/10%/20%

[SAMAEL]

Hello everyone,
im new here and have a (noob-)question about changing the necro skill as "val-gaav" described in this thread:

viewtopic.php?t=5297

ive already done some txt-file editing with lodman/resedit.exe, but unfortunately i have absolutely no idea how to use those "scripts" to change necro skills, for example from 10%/20%/30% to 5%/10%/20% and use them in multiplayer random maps. any help would be greatly appreciated.
thx in advance.