The legacy apps are available in Blackberry world
The BB10 native app, is now available in BlackBerry World.
Please go to http://appworld.blackberry.com/webstore/content/1222/ on your phone, to download it.
This is an app ported from the Android so please use the Android Help files
See Android Help files here
For the new Android Blackberry, please go to google Play and also use the Android help files