@Victorique, I've made the maximum number of dice to 4 and maximum sides 20. See if it works now. I'll probably have to put the command somewhere... for reference to anybody else: /roll XdY is the command, where X is the number of a Y-sided die.
Really, @Lucy?!?! I could ask that or start asking myself, 'Where in The World is Lee Jordan?' or 'Where in The World are Zack and Ivy?' I mean no one knows where everybody us at.