How should I response mail thread properly?

[James Chain]

Hi,

Everytime I want to response mail thread like this:
origin
   |
   -------response
                |
                ------------- here I want to

[problem]
but always got this (ps. I start this mail thread):
origin
   |
   -------response
   |
   -------- here I got

[Question]
How should I write mail responding title properly?

James Chien