Dreamhost has a one-click install function. It is easy to install a new program. Now I will go through the Joomla! 1.5 installation.
In the Web Panel of Dreamhost, choose googies > One-Click Install
Choose the Joomla! 1.5 and site/directory to be installed, and also give the name of database.
Later, I receive an email tell the steps of installation. I added some screenshot on it to make it vivid.
Now visit the site to finish your installation with these settings:
1 : Language
select ‘en-GB – English (United Kingdom)’ and click Next
6 : Configuration
scroll down to ‘Load Sample Data, Restore, or Migrate Backed Up Content’
This is a brand new installation, so 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)
For more Joomla support click http://forum.joomla.org/