in the solution I gave you, there is nothing specific to BlackBerry devices. You basically send an HTML email, and the recipient clicks on one link of the other, that will open the browser with a complete HTML form.
then the rest if dealt by the web server (and not the BlackBerry Browser).
If that solution matches your need, then all you have to care of regarding to BlackBerry is how the email is rendered on the screen, the rest is learning how to code on serverside.
if that solution does not match your need, then you need to be more specific.
The search box on top-right of this page is your true friend, and the public Knowledge Base too: