Hi…
If not including on all pages, you’ll need to list (separated by commas) the page/post IDs in the dialog box in the admin area. To help determine which unique page ID is assigned to a given page, I usggest installing the ultra-light and ultra-handy Catch-IDs plugin. (Be sure to donate to Catch Themes if you find it as useful as I think you will.)
Then, just make a note of the pages and/or posts where you want the icon to appear (or the opposite: you may enter the pages and./or posts where you don’t want the icon to appear, and then set the icon to appear everywhere except those pages/posts listed).
Cheers
Lewis