You can find all of the code required to alter your theme located in all of the files in your current themes directory. They should be located in
//resonancepsychotherapy.com/site/wp-content/themes/verbatim/
Every file in that directory contributes to the function and presentation of your current theme in some manner.
[edit] Just an after thought…
You are referring to just your theme, and not how to log into your WordPress Blog and post content, is that correct?
If you mean to login to create/edit posts/Pages and general site maintanence you need to login at:
http://resonancepsychotherapy.com/site/wp-admin
Whoever you paid to create the site should have given you a Username & Password
