Not sure the right terminology here...
When a user goes to:
I need it to resolve to:
This is because a WordPress plugin I use only works if the page name is part of the URL.
DreamHost support tells me that I need to do this through my .htaccess file. I have modified .htaccess before and generally know how to edit it, but I need someone to tell me explicitly what I need to add. This is not my area of expertise.