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To get to the settings for iViewer on your iPhone/iPad/iPod Touch, first open the 'Settings' app from your home screen.
Then scroll down the settings list until you see 'iViewer 4' in the list, and select it.
You will then be taken to a screen similar to this:
On Android devices, you need to first launch iViewer, then hit the 'options menu' button on your device.
Depending on the Android device being used, this could be a hard button or a button in a navigation bar at the bottom of the screen.
For information on all the settings, see the iViewer Settings page.