[xAndrewx]

you'd substring it.

function onActionServerside() {
  if (params[0] == "kick") {
    findPlayer(player.chat.substring(5).trim()).setlevel2("level.nw", x, y);
  }
}
//#CLIENTSIDE
function onPlayerChats() {
  if (player.chat.starts(":kick")) {
    triggerserver("weapon", this.name, "kick");
  }
}

So, first we check if the player is saying ':kick', if yes it will look for the player that is stated after the ':kick' command. Here's an example:
':kick xAndrewx', would kick me.