How to get rating more than 500??

I don't know what kind of rating you're talking about, but to get a 500 in parenthesis after your name, you just have to make 500 posts! Once you've made 500 posts then you can use the different features on this site. It doesn't matter if others rate you or not. So to reach 500, you just need to keep posting! Just respond to as many discussions as you can! Good luck!