comments.php problem on Photocrati Theme

Hi I’m having trouble modifying the comments.php in my Photocrati 4.06 theme. I had a look at all the posts but there is no <form> and there is </form> but if I just insert the code anywhere it comes up with both the original comment box (no password field) and a new one (with field).

The theme comments.php file is really long so how do I know what I’m supposed to take away to get rid of the doubling up? Also, I don’t want any of the functionality affected.

Let me know if you need the code and I’m happy to email it.

website is https://erameri.com