I just created a Trac with the one-click installer and all your questions are answered in the mail you receive when you create it... Here is the mail I received(Some info are replaced with ):
We just installed the files for Trac as requested at:
To configure your logo and other settings for your Trac site please edit the file:
This trac install is using the following SVN repository: /home//svn/
You can begin setting up your users for your Trac install through the panel:
Also here is a detailed guide on administrating your Trac site:
The Happy DreamHost Installer Robot"