which information do I need to add?

Hi
I'm trying to set up Multi-DB

In instruction there is few things I can not understand.

Here is extracted instruction from install manual

-------------------------------
///DB Settings
$dbname = "xxxx"; //This is your current database
$blog_table_prefix = 'wp_'; //Prefix of your wpmu blog tables, most likely this won't need to be changed
$newdb_prefix = 'xxxx'; //This is the prefix of the db's you're moving your tables into - we assume they are all the same, if not, you're in trouble

//We need info to connect to the databases
$dbhost = 'localhost';
$dbuname = 'user';
$dbpass = 'pass';
-------------------------------

1.
$newdb_prefix =
I need to put my wordpress site's databese username here?
(already set up from C-panel)

2.
$dbuname = 'user';
$dbpass = 'pass';

What do I need to put for those two?

I use hostgator,So I thought I need to put hostgator's login information for them??

or something other??

Thank you