BB Bold :: BBM Group - Lost Administrator Password?

I had created a group in BBM long time back and I was the administrator. Now it contains 23 members and I wanted to remove one of the members from it. But I see that I am not the administrator any more and if I need to make myself an administrator; I need to enter a password. I have never created an admin password for the group. Usually whoever is the administrator there should be a 'key' symbol next to the member's name in the list of the group. But none has such a 'key' picture next to his name. Is there any way that I can reset or recover the admin password