Nice, my pin is 2A098B0F, by the way how can i invite people via just pin? I only see barcode.
Run BBM. Tap at lower-right to bring up the action menu. Tap "Invite to BBM". Type the PIN into the "To:" text field which has the little "+" control triangle thingy at its lower right corner. Wait for the dropdown to appear showing "PIN: xxxxxxxx" and tap it. Click Send at upper right.