Turn radio off then back on. If mesasge is still there undo negative terminal to battery for a couple seconds. Radio should then be blinking when turned on.
There are 6 'channel selection' buttons. Push that first button once. This will cause a '1' to display. Then push the 2nd channel selection button once. This will cause a '1' to be displayed next to the '1' which is already dispalyed. Do this with the 3rd and 4th channel selection buttons causing a '1111' to be displayed. Then push the Volume button in as if you are trying to select the treble, bass, etc. Then push it again. Your FM and cd and everything will now work like normal. This is called entering a 1111 code into your radio.