I am struggling to find any details about how to display ALL Custom Posts

I am struggling to find any details about how to display a standard page of results of ALL new custom posts.

I have a category created called:

aa_celebrity but http://adoptionarena.com/aa_celebrity find no results.

The equivalent page on the demo would be:
http://custompress.co/plant/

(Note: all the taxonomy classes can be searched correctly for example: http://adoptionarena.com/aa_celebrity/location/england/ )

Thanks
Chris