We're so glad you've decided to share your work on PRX!
The first step is signing up for an trial account here - however, you won't earn royalties for any pieces you publish and you will only have two hours of upload space with this entry level account.
If you would like more expansive access the Exchange, including unlimited upload space and the ability to accrue royalties, then head to your My PRX page and pay the $50 annual membership fee (if you're part of a network or station, read more about our group membership option).
Once you have a membership, you can start posting your stories to PRX. Here's a link with articles that can help you get started with uploading your show's episodes to the Exchange.
High five!