why my account always show the same number?

If you have posted a response, the number should go up, if you make it more than just a short sentence. This discussion will count as soon as I post a response to it. A discussion is not validated until someone responds to it. I hope you have not been commenting instead of responding, as that could be your problem. If you want to see your points increase, be sure to go respond, in detail to people. Invite new friends. Things like that. Then you will have people responding to you. You only get a point one time for each discussion.