Twenty Twelve and 'Leave a Reply'

Hi Everybody
Just installed a child theme and so far it works great!
However the link ‘leave a reply’ is now at the beginning of a post and for long posts this is a bit strange….
Or am I missing something?
You can look at my sample post:
https://sailingschoolgrenada.com/sailing/

Which file do I have to change if I want to have it on the bottom where it used to be with other themes?

Thanks!