To add a feed, use: Menu > Manage Feeds > Add New Feed and enter the feed address in the Feed URL field.
Another approach to add feeds is to import them from an OPML file or online podcast directory
BeyondPod also supports Local Feeds. Local feeds are "virtual feeds" based on local content stored in a device folder - for example for local music or voice notes. You can create Local Feed for any folder on your mobile device. To create a Local feed, add a new feed, give it a name but leave the Feed URL empty. Click on More Settings >> and select your folder in Podcast Download Folder field.
All audio/video files in this folder will appear as (virtual) podcasts and can be played using the built in player. You can use this for your music files or voice notes (if you point it to \My Documents\Notes). If you don’t want BeyondPod to automatically delete the your local files when they finish playing, make sure you set the Allow Podcast Deletions option to No in the Feed Properties dialog.