if we are talking about l2jFrozen
/config/functions/l2jfrozen.properties
# ----------------------
# Skill Config -
# ----------------------
# List of Skills that are allowed for all Classes if CheckSkillsOnEnter = True in config/protected/other.properties
AllowedSkills = 541,542,543,544,545,546,547,548,549,550,551,552,553,554,555,556,557,558,617,618,619