Hello. Thank you for posting this.   I am a Pandora Plus listener. I do not see a small "i" on my Android app.  The desktop app has an "i" (Info & Options) choice, but then there is no little "pencil" next to any button.  And there aren't any other paths to lead me to editing any thumbs options.  I also checked the web version and cannot find any way to view my Thumbs Down list.   ****UPDATE SOLUTION**** (Pandora Plus) For anyone as frustrated as I was.... go to the WEB SITE (Pandora.com), and do THIS: 1. Pandora.com 2. Log In 3. Click on "My Collection" (top left) 4. Choose  (click on) Station where you want to edit the Thumbs]  5. SCROLL DOWN until you see "Thumb History" 6. Look to the right and you'll see a blue highlight around a "Thumbs UP" icon (with a number of songs you've given Thumbs Up).    CLICK ON THE THUMBS DOWN Icon.  It will turn blue (highlighted).   7. Look for the song you want to "undo". Hover your mouse over the song and 3 DOTS will appear on the far right.  Click on those dots and the option to "Delete" will appear. 8. Delete that song from the Thumbs Down list.   I assume this deletes the song from the Thumbs Down LIST and not from your station. I hope this helps someone else.    ... View more