Customise search on Wordpress template

I have bought a Wordpress template for my website. The template is made for estate agents but mine is a listings site so I have had to customise it quite a bit. There a two things I am stuck on: 1. A the moment two of the search options are minimum and maximum price. The options are numerical. I was to change the options to one, two or three dollar signs ($, $$, and $$$). It would still only return results within that range (e.g if min $ was chosen, and max $$, it would exclude $$$ results). 2. I want to add a comment form to the bottom of the listings - the same as a blog comment form.  I tried copying the code from the [login to view URL] into the [login to view URL] but it hasn't worked. Perhaps because the listings are a custom post type, or perhaps because I put it in the wrong place. I don't expect it to take very long. I just don't have the required php skills.