08-05-2013 11:00 AM
You may register on the vendor portal for free:https://appworld.blackberry.com/isvportal/
There is a sandbox for testing purposes.
What kind of app do you have? Is it for BB10, PlayBook or the older OS versions?
08-05-2013 12:22 PM
On BB10 for testing purposes you are supposed to distribute your app using the debug tokens.
You can also use the Vendor Portal and the sandbox to test. Here you have some useful documentation about app distribution: http://docs.blackberry.com/en/developers/subcatego
More about the sandbox: http://docs.blackberry.com/en/developers/deliverab