I don't think the Seriously Simple Podcasting plugin works with my WordPress site

There could be a number of reasons for this, but the most common one is that you have another podcasting plugin activated on your site. Make sure you deactivate any other podcasting plugins (e.g. BluBrry PowerPress, PodPress, etc.). If you have done that and the plugin is still not working as it should then have a read through this documentation as well as the support forum – if you don’t find what you need there, then create a new topic in the support forum.