How to enroll in BBM Beta for Windows Phone?

Why don't you just download regular bbm, you have to be registered thru BlackBerry beta zone.
 
Why don't you just download regular bbm, you have to be registered thru BlackBerry beta zone.

I did, and been using it for several months, but it's a really bad app, terribly slow, and most of times messages won't get through.. So can you give me link to join Blackberry Beta Zone, please?
 

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