how to restart the arduino BT(urgent!!!)

I want to ask how to reset the default setting of Arduino BT, by using it’s reset pin 7?
I would like to know the step of how to reset it, and I am not really understand it’s internal structure or circuit. I am not dare to make it myself without any guides…as I am afraid that I will kill the board…

By the way, my problem posted in my last post, the passkey problem still can’t be solved…
I found that the passkey can only pass “one” time!!! When I close the bluetooth, it can’t be pass anymore, although the ARDUINOBT can still be detected…
I hope that you guys can help me as I need it for my project urgently~~

Thanks for your attention.

Regards,

Shek