Why is my VW Jetta radio in safe mode after replacing the battery?

Had to replace the original battery yesterday and since then the radio has been in "safe mode". Found the code to put in...but where do you put it in? What do you do? It's a 99 VW Jetta Wolfsburg.Why is my VW Jetta radio in safe mode after replacing the battery?press and hold the 'as' button until dashes appear, then put in code as normal, (first number..first button, and so on..)Why is my VW Jetta radio in safe mode after replacing the battery?Check your owner's manual or call the service dept. This isn't for everybody to know, so they can steal your radio and make it work.