If you want to change the List you saved your Keyword to, then just head over to the Lookup tool to make the change. 

  • Type go lookup then into your address bar then hit Enter
  • Search for your Keyword  in the search box at the top of the page

  • Find the keyword you want to move into another List

  • Click on the pencil  to edit the row

  • Use the drop-down menu to select the List you want to move the Keyword to

  • Click on  to save the changes, and you're done!

Just keep in mind that by changing the List a Keyword belongs to means members of the original List may lose access.