How to comment or reply to others?

Hello everyone, I am having some trouble replying to other comments, I have submitted some patches and then I have received some comments from reviews, I tried to reply to them by just prefixing the subject line Re: instead of replying, I have posted a new thread.. I looked into the FAQ, I have not find the answer, I have google it, and I have not find any answer.. could someone please direct me to the correct article which talking about replying and comment in the lkml, or give me some tips! I would appreciate it. Kind regards, Abdalrhman Masalkhi