Radio in Safe Mode

I recently changed my battery on a 99 A4 2.8.
Factory stereo is in safe mode. I have the code to unlock it, but do not know the proper steps to unlock it since I do no have the raido
guide in my car manual.
Any help would be greatly appreciated as driving with no music sucks!
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maybe this will help http://groups.google.com/group/alt.autos.audi/browse_thread/thread/db2672f8edf01984/5fd27e23ec5c1068%235fd27e23ec5c1068
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