Search for something like:
Then you'll see numbers between the parentheses () e.g.Code:addSkillXP(
The first number should be how much xp you want the player to earn. The second number is a sort of code telling the client which skill you want the xp added to. 0 is for the attack skill.Code:addSkillXP(100, 0);
Simply change the first number if you want the xp to change.