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Right-click on the rulers around your page and you will find the option to change measurement units. This can also be done via the preferences with no document open - to make your choice the default for new documents. Note that this method will not affect existing documents.
To change the ruler units in your current document, right-click on the ruler and pick Inches.
To change the ruler units to inches for all new documents, close all files but keep InDesign open. Open Preferences > Units & Increments, and change Ruler Units to Inches. Any subsequent document you create will choose Inches by default. It will not change the units of files already created.