How will I know when it is ready for the code to be put in & is there any thing to do once I put in code
Hold down "mode" and "scan" and it should change from "SAFE" to "1000". You should then be able to change the digits with the preset buttons to your code, and then hold "mode" and "scan" again to accept it.
If it says "SAFE" but doesn't have a number on the screen at the same time, it is not locked up, but if there is a number on the screen that is indicating how many "incorrect" attempts have been made. You have three chances, and then you would have to leave the radio on for an hour to reset it.