Hi, is it a search shortcut? Those usually have a magnifying glass overlaid on the tile and when you click them, they add something like @google to the address bar. You should be able to "Unpin" those by hovering your mouse pointer over the tile, clicking the ... menu button and using Unpin.

If the search shortcuts are stubborn, there is another way to remove them:

(1) In a new tab, type or paste about:config in the address bar and press Enter/Return. Click the button accepting the risk.

(2) In the search box in the page, type or paste improve and pause while the list is filtered

(3) Double-click the browser.newtabpage.activity-stream.improvesearch.topSiteSearchShortcuts preference to switch the value from true to false

That should automatically clear the next preference in the list, browser.newtabpage.activity-stream.improvesearch.topSiteSearchShortcuts.havePinned, but if it doesn't:

(4) Double-click the browser.newtabpage.activity-stream.improvesearch.topSiteSearchShortcuts.havePinned preference to display an editing field, delete its contents, then press Enter or click the blue check mark button to save the change.

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