There is no correlation between your degree and the job of an RJ. You need to have a flair for talking, enjoy your music and have enough stuff to fill the awkward silences in any communication.
If you think you possess these, simply look for the call for applications, auditions or the numerous ways that RJs are selected. Go in with your best and enjoy the audition. If you live it like it is supposed to be you will be on air soon.
Do get in touch with the stations in your city and find out if they are looking for new voices.