I broke my site – Need help from Sakin-God

Hi Sakin D: I broke my website whilst fidgeting with this last night. I changed a setting I wasn't totally familiar with and now I have a redirect loop beatmania.co.nz/login redirects back to beatmania.co.nz As a result, even I can't login. To od have access to the backend, so what I would like to do is identify the line of code in the theme's configuration file - I think this might help? And if it does help/fix it, where do I find the theme's settings file? I've already looked in the themes directory but didn't see anything obvious