The user dashboard is not the same as the WordPress admin dashboard. You can get an idea of what it looks like from the
Vantage demo site (although the default account does not have any listings posted which is why there is no information listed), but for a user who has posted listings, they will see them displayed in that user dashboard. The sidebar also shows other options available for the user. The information in each user dashboard is visible only to that user who is logged in.
The demo site is a fully functioning version of the theme, however data cannot be saved to it, and you don't see the register or login links because it's already logged in as a default user. The register and login page is themed (not the default WordPress login screen), as per the screenshot below:
As mentioned, the demo site does not save data so whilst you can get an idea of the listing process, you won't go all the way through. The PayPal portion of the process simply redirects them there to complete the transaction and returns you to Vantage afterwards. I hope this information helps. Thanks.