You should have a mic to be in this clan, and know how to use it.

To enable Steam in game you must launch Origin with Steam, AND have in game overlay Disabled in Origin settings.

Use the official website link above to gain access to the steam group. Or just search for "BF3Voice" in the steam group search.

The steam group also includes information on how to use steam with BF3!!

The steam group chat room is a good staging area to meet others willing to voice chat.