If you did the One-Click install, the install robot would have sent you email with instructions on how to get started. Here's what they typically send:
We just installed the files for Joomla as requested at:
Now visit the site to finish your installation with these settings:
1 : Language
select 'en-GB - English (United Kingdom)' and click Next
2 : Pre-installation Check
3 : License
4 : Database
Database Type: mysql
Host Name: DB.EXAMPLE.COM
User Name: DB_USER
Database Name: DB_NAME
5 : FTP Configuration
6 : Configuration
scroll down to 'Load Sample Data, Restore, or Migrate Backed Up Content'
if you are upgrading from version 1.0.x, select 'Load Migration Script'
Old Table Prefix: jos_
CHECK 'I have already uploaded the migration script to the server (e.g. via FTP/SCP)'
CHECK 'This script is a Joomla! 1.0 migration script.'
click 'Upload and Execute'
Otherwise, select 'Install Default Sample Data'
click 'Install Sample Data'
Site Name: (the name of your site)
Your E-mail: (admin email)
Admin Password: (pick a password)
Confirm Admin Password: (re-type password again)
7 : Finish
You're almost done! FTP to your site and remove the "installation"
directory. Then click the link at the top for "Admin"
and log in as "admin" with the password you just set.
Have fun! If you need help, there's a help area in the Admin section,
as well as the official forums here:
The Happy DreamHost Installer Robot