Steve,
You've posted the same question to three forums!
We've already answered your question in this Moodle forum (see Using Moodle) and in the bigblubutton-setup mailing list (see this post).
In the future, please pick and post to only a single forum. We'd rather be working on BigBlueButton than trying to answer the same question in three places each time .
Regards,... Fred
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BigBlueButton Developer