thank you so much.

不好意思，我还有贴图问题要请教。因为我还没有成功地贴上去。 当我按了图片小方框后，出现了''choose file", 它下方的大框框里显示 “暂无预览"，于是我打开iphoto, dragged dental paste picture, and dropped it into 大方框里。but what it came out were letters instead of picture. I really need your next help. Thank you.