Error with step 2 of installation.

[Alfa1]

I am trying to install Photopost pro and integrate it with vBulletin 3.5.4
With step 2 I get this error message:

Warning: mysql_connect() [function.mysql-connect]: Access denied for user: 'username@localhost' (Using password: YES) in /opt/domain/www.mywebsite.co.uk/HTML/photopost/install.php on line 547
I cannot connect to the PhotoPost MySQL server. [host:$host][mysql_user:$mysql_user][mysql_password:$mysql_password]. Check your config-inc.php for the correct settings and rerun.

'username' and 'mywebsite' have been replaced. Does anybody know what has gone wrong?
Many thanks in advance. If you need my server specs let me know.

[Chuck S]

If you get a mysql connect message it means the mysql information one or more of the variables you have entered on the config section of install is incorrect.

[Alfa1]

I figured that. You can't tell from the error which one that would be?

[Chuck S]

With that error it could be host username or password.