With the News app , tap Select, tap the issues you want to download, then tap below the issue cover (or touch and hold the cover), tap Remove, then tap Remove from My Magazines.
The issue’s cover and content are removed from iPod touch and from any other devices where you’re signed in with the same Apple ID and News is turned on in iCloud preferences or settings.
To remove multiple issues, tap My Magazines or Downloaded near the top of the screen, tap Read magazines with Apple News+.