The database script file is located on the SQL folder inside the FA folder.
I am using it under Windows, so the folder path is:

C:\xampp\htdocs\FA\sql

Inside the SQL folder, there are some ready_made files.
I chose the one named--->   en_US-new.sql
This file has the scripts to create the tables in your database.
When creating a second company, I'd rather prefer not to do it from PHPMyAdmin, although I believe it is possible.

Just select the script I mention above and see if it helps.
Rgds.
Alberto.

Greenawise:
username must be admin
The password you setup should be the default admin password specified in the field "new script admin password"... I think.

Anyway... I made sure that the admin password I specified is the same admin password the the first company had.
And I've created two separate companies on several computers... no problem.

your login name must be admin
your password would then be the admin password you specified at time of creation.
See if it helps.

Rgds.
Alberto.

Greenawise:
go to SETUP tab
under maintenance, on the right side, select CREATE/UPDATE companies
Here you may create a new company from within FA
You may browse to the FA SQL folder to select SQL to create the company.
Good luck.

Alberto.