[tor-relays] setting up a Tor exit node

[esolve esolve]

I want to use Tor browser bundle to set up a Tor exit node
in vidalia, I click "set up relay" -> sharing
then there are some options,
I checked "Relay traffic for the Tor network(exit relay)" and then click
"ok"
however,  it doesn't work, and the exit relay option  is automatically
unchecked, while the option "relay traffic inside the tor network (non-exit
relay)" is checked

how can I set up a Tor exit node?
thanks!
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