It would largely depend on what you are seeking. If you want opinions on your website then you might want to post a thread on *Reviews* section. Or if you merely want to discuss your site in a conversational way I would post on *General Business* section.
When I typed the word "kontrahent" into the Google Translator, my laptop began to emit smoke and then flames shot out. At that point I shut it down, so....no idea what this word means.