Select your image(s) and you can:
•Add to Page - selected image(s) are added to your cursor for placement on the spread. Multiple photo selection allows you to place multiple photos on the spread.
•Add to myContent - Selected image(s) are added to the myContent folder on your spread. Close the Image Manager to return to your spread. Open the myContent menu in the toolbar on the right. Drag the selected images from My Content to image placeholder boxes or the preferred locations on the spread.