From your vrpCentral login (gueststream.net) select the "Unit" menu item and click "edit" next to the unit you wish to edit.
On this page you will select the "SEO" tab and update the "Page Slug" field. Make sure to click "Save changes" when you are done.
The attached video will walk you through the steps.
Important to consider
Page slugs consists of solely lowercase alphanumeric characters, dashes and underscores, without 2 or more dashes in a row (sequences of underscores are allowed). Furthermore, a slug cannot start or end with a hyphen.