If people here don't want to be helped what can I say?
Sit in a chair and put your hands on a keyboard. Your wrists are in a supinated position. Now turn your hands inwards and upwards and you now have the supinated position.
During a biceps curl you turn your hands first inwards and then upwards towards your shoulders.
Flexed arm in the pronated position (top); with the biceps partially contracted and in a supinated position with the biceps more fully contracted, approaching minimum length (bottom)
http://en.wikipedia.org/wiki/Biceps
Sitting in a chair and putting your hands on a keyboard, your wrists are in a PRONATED position. You can't turn your hands inward to the medial, as your thumbs are pointing at the medial already. In order to put your hands into the supinated position, you must turn your hands over outwardly, laterally, away from the medial, resulting in your thumbs pointing away from the body. Supination/Pronation movements of the wrist and forearm, have nothing to do with them moving towards, nor away, from the shoulder. You can (and do) Supinate and Pronate your wrist and forearms, even with your arms straight out. Holding your arms straight out, with your palms down and thumbs pointing inward, is Pronation. Turn your palms up and thumbs facing out, laterally away from the body, and they are now doing Supination. The photos are correct, but your description of how they got there are completely wrong.
Think I shall pass on trying your biceps machine.
