If you have things set up right, it should ask you to put in the user name of your WordPress account rather than asking for all that other stuff.
What does your $bb->wp_table_prefix setting look like?
It should look like
$bb->wp_table_prefix = 'wp_'; (or whatever the actual prefx is).
The “Forum Name” can be anything you want. For example, one of the forum names on this site is “Installation”.