Dreamhost, Svn. Trac is then the last step right? So after it is all installed, you have to do these last two steps to get admin rights.
First enable auth: (add this to the end of the .htaccess file in the trac domains folder, please remember to change the caps with your info)
AuthUserFile /home/YOURUSERNAME/svn/SVNREPONAME.passwd
AuthName "Trac Access"
AuthType Basic
Require valid-user
Second, in that folder run this: (where it says SVNUSER you must change to be the name of your svn account)
trac-admin . permission add SVNUSER TRAC_ADMIN
(where SVNUSER is the user name and TRAC_ADMIN is the permission to add, to make this a little more confusing, TRAC_ADMIN is the permission you need to add, so just change the SVNUSER part)
This all ties trac to your svn user's that you setup in the dreamhost pannel.
Ok ok an example:
trac-admin . permission add rek TRAC_ADMIN
Simple eh!