Open Desktop Manager. Click on Application Loader.
If App Loader does not immediately see that you have a new program to add (JiveTalk), you can press the Add button (I forget what it is labeled) and then "point" App Loader to where the JiveTalk file (ending in .alx) is located.
Proceed with the prompts.
OR, just go to beejive :: JiveTalk mobile messaging
with your BB browser, and download JiveTalk over the air, much simpler.