Sign into Podcasts on Mac
In the Podcasts app on your Mac, choose Account > Sign In.
If you already signed into Music or the Apple TV app, you’re automatically signed into Podcasts.
Do one of the following:
Sign in with your Apple ID: Enter your Apple ID and password, then click Next.
Create an Apple ID: Click Create Apple ID and follow the onscreen instructions.
To sign out, choose Apple menu > System Preferences, click Apple ID, click Overview, then click Sign Out. See If you sign out of your Apple ID preferences.