This has now been corrected for you, and you are able to log in. The issue here is that while your site is at root, its using files from a forums folder. There is a copy of files which are residing in the root of your FTP, and those are not actually the files your site is using. So you are editing the wrong files there. Note, you should not need any of the suggested edits above for your site to work correctly, so they have been removed.
All that was needed there was the conf_global.php file to be edited to https correctly. You were editing the wrong one there.