My radio had a message that asked for a code
I put in the wrong code, and now I'm unable to unlock th radio is there anyway to get back to the code prompt. it's a 95 c class original radio

Hi
This info is from my radio recoding guide:

If Unsuccessful:
If "WAIT" appears on panel, the radio must be left ON until "CODE" appears. This will take either 10 minutes or 24 hours, depending upon the number of attempts made.
7. Once CODE appears, continue with step 3.

Where did you get the radio code from? Is it possible the radio was replaced at some point? You can ask a dealer to run a VMI on the car and see if the code you are using is correct or not.
I assume you are entering the code correctly-just enter the 5 digit number and then press the "SC" button on the lower right corner (or any of the "tune" or "SEEK" buttons will also work. Make sure the number on the screen (the code number) is correct before pushing any other buttons, if it is wrong, shut off the radio and start over.

Gilly