Hi Joseph.
It's ok about creating a new account to post here, each Nabble forum requires a different user account, they are not shared.
Are you trying to import an already existing mail archive from another mailing list?
Do you have the mbox file?
If you can get it, please send an email to support at nabble.com with the download URL or the mbox attached to the email.
Don't forget to mention where you want the archive imported to.
Regards,
Peter
Nabble staff. We never ask for passwords.