Blaupunkt 300 f

Question

the battery of my car was disconnected, when connected again my radio
and cassette system blaupunkt 300F autostore shows the words on the display as SAFE. I have the radio code from the Vauxhall dealer how do I enter it into the radio because according to the manual its impossible to get on the menu where you are able to enter the code.pressing AS while the ignition is on and turning the radio on as well is not working this time even if i know that is working on different cars doesn't work on my.