CMD:kick(playerid, params[])
{
    new pid;
    if(!sscanf(params, "i", pid))
    {
        Kick(pid);
    }
    else
    {
        SendClientMessage(playerid, 0x999999AA, "useage: /kick [playerid]");
    }
    return 1;
}

CMD:kick(playerid, params[]) //The command, playerid is the player who typed the cmd and params is the string entered after the command
{
    new pid; //A new variable called pid
    if(!sscanf(params, "i", pid)) //using sscanf, if params (checking parameters, "i" (the player id who you want to kick) "pid" the variable (id of the player u want to kick)
    {
        Kick(pid); // Kick (the player (id))
    }
    else //if you didn't entered any string after the command e,g /kick [string or id) then
    {
        SendClientMessage(playerid, 0x999999AA, "usage: /kick [playerid]"); //send a message saying use kick [playerid]
    }
    return 1; //Stops the script after everything is executed, 1 is true 0 is false
}