you export to itunes. Calibre recognises itunes and will export to there. the fact that its green right now shows that to be the case. It doesn't usually recognise an ipad or iphone or ipod directly because it assumes you want to use itunes to sync your books. iTunes should show as a separate icon in the toolbar, once you are connected to itunes via the connect/share icon.
Just select the book/s you want to go to itunes and choose "send to device" which is yet another icon. Dont worry about the main memory or anything because you arent actually sending to the device, just to itunes.
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