Installation Error on a subdomain

Hi Guys,
Before I start, I am a bit of a knobhead with this…

I just want to trail Piwik, installed it via FTP here: (unsed subdomain)… I even managed to fix a few errors.

Now I get this message:
(Bluehost Support is as helpfull as a bag of rocks)

Error while trying to connect to the database server: SQLSTATE[28000] [1045] Access denied for user ‘Heinrich’@‘’ (using password: YES)

I have tried a few different things but no luck…

Thank You