To create a circular array from one or more objects first select them.
Next click the Edit→Array→ button. This dialog box shown below will appear.
Enter the center X coordinate of the rotation center.
Enter the center Y coordinate of the rotation center.
Enter the number of items.
Check to rotate the items as they are copied.
Click the button to create the array.
Remember, you can always click the button to undo a change. This lets you easily experiment.