Once you're in edit mode on the concept details screen, you can change the image used for the concept by tapping on the current symbol. This will bring up the option to select a picture from your iPad library or take your own photo using the iPad's built in camera.
To the right of the page is the option to change the speech from a male voice (Graham) to a female voice (Lucy). You can also record your own voice by tapping on the "User +" button. This will open up a voice recorder. Simply press "Record" to start recording and "Stop" when you're done.