here are exception and you can contact njt for more details if you want to know. If you are looking to be a translator, you can write a response at this thread (Translators Directory) or find the group who works on the series you're looking for.
I hope this helps.
Here is a little longer version.
To register as "(International) Translator" on MH:
Please visit Translators' Guide and follow the registration instruction. You must upload at least 5 translations before requesting your status to Translator/International Translator. Since MH does not offer raws, please use your own manga to translate. As an exception, a few chapters from mangareborn are available here on MH. If you re-translate from English to other languages, please evaluate the quality of English translations of the (JP) raws. (Also please do not forget to credit English translators.)
To join any scanlation groups:
Please visit Staff and Project Resources. It is like a classified board. Scanlation groups are not part of Mangahelpers, so please make your own judgement to decide which one to join when you do.
To request your status change (here):
To introduce yourself:
- Request to become an "International Translator" if you translate Non-JP to other languages.
- Request to become a "Translator" if you translate JP to ENG.
* Visit Staff and Project Resources and post in Translators Directory.
* Introduce yourself in Meet the Translators.