Skylight can import podcast subscriptions from an OPML file. Most podcast apps allow for exporting your subscriptions, but specific instructions vary by app. Instructions for some common apps are listed below.
Once you have saved the .opml file to your device, visit your show subscriptions page on Skylight, use the upload icon at the top of the screen to show the "Podcasts" import tab. Then tap the file upload box and browse for the .opml file to import your subscriptions to Skylight.