How to reply a post?

This can be done in three ways:
First: “Fast Reply” on the bottom of the thread as the same as posting a new one;
Second: except that you must be in a thread, and you need to click "Reply" on the right corner below the post;
Third: click “Reply” besides “New” on the right corner above threads list.
Attention: moderators may close a thread to disable members' reply