The translation system for manga (Mantra Engine) requires a different login account than DLsite.
The required ID and password are automatically sent to the email address you have registered on DLsite at the time of translator registration.
Email subject name: "[DLsite みんなで翻訳] マンガ翻訳システムへのご招待"
Please check your junk mail folder if you cannot find the email.
The password received in the automatic email is temporary. You won't be able to continue using it after it expires, so please use it to log in to Mantra Engine as soon as possible.