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Open a file in Adobe InDesign. Click the Selection Tool. Click the object you want to unlock. Click Object in the menu bar at the top of the screen. Click Unlock.

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To do so, double-click on the pink app with the letters "Id," click on File in the menu bar, and click on Open…. Then select a document containing locked objects and click Open. It's the black pointer at the top of the Tools menu on the left side of the screen. To select multiple items, press Ctrl (Windows) or ⌘ (Mac) while clicking the objects you want to unlock.  The items you selected can now be moved or manipulated in the document. Click Unlock All on Spread to unlock all the objects on the current spread (page).