If you hit that "publish" button and get an error message, it likely means that you have tried to publish an episode that does not meet the automated delivery system's expectations for segment count and length.
Your error message should tell you the specific problem;
If not, go back to the "Basics" tab and check your audio segments. Are they in the correct order? Do the segments fall within their min and max time restraints? Did you forget to include your promo?
If you need to change the time restraints or segment count for your show, please email help@prx.org.