downloading WordPress themes to BlueHost?

I am downloading a WordPress theme to my BlueHost website Then I type in the address line mydomaindotcom/wp-admin to download it...It asks for a UN and PW. I can NOT get that to work. It doesn't accept my WordPress UN/PW or my BlueHost UN/PW. Is there a DIFFERENT UN/PW I need to know? What am I doing wrong?

Public Comments

1. You should be able to just FTP or file transfer the files into the correct folder. It should be your Bluehost UN/PW that you need for folder access.