Using ICommand how would I add permissions to a command?

So I swapped to CommandBase and I have to say its a bit simpler. I mean a server-side command. It seems that by default you must have OP to use them

When It auto-implemented the needed methods checkPermissions never appeared. Also what would be the necessary checks? Sorry if I sound like a "noob" I'm used to Spigot.

I think I misunderstood you or the otherway around, but here is what I have so far. I extended CommandBase, but let Eclipse automatically add everything

public class Commands extends CommandBase{
ICommandManager icommandmanager;
 HashMap<String, HashMap<String, Integer>> plyrStats;

 public Commands(HashMap<String, HashMap<String, Integer>> plyrStats){
   this.plyrStats = plyrStats;
 }

@Override
public String getCommandName(){
	return "resetstats";
}
@Override
public String getCommandUsage(ICommandSender icommandsender){
	return "ResetStats";
}
@Override
public void processCommand(ICommandSender icommandsender, String[] args) {
	resetStats((EntityPlayer) icommandsender);
} 
}

Sorry, but could you show me what you mean? Every time I try to override checkPermission it says that it is not a proper method and removes @Override