You have created your feed in Blogger, and I'm afraid it's a complete mess. You don't have an 'itunes:image' tag, and you don't have any 'enclosure' tags containing the URLs of your media files. The Blogger source page contains an embedded player with an audio file, but the coding is unreadable - there are masses of convoluted code in both the feed and the iframe containing the embedded player which make is impossible to red. (And, as usual with Blogger, it's all on one line.)
I can't detect what format your media file is. It may be a format which is not acceptable to iTunes: audio files need to be MP3 or M4a - if it's an incompatible format that might be why Blogger hasn't formed an enclosure tag.
You will have to sort this out with Blogger (or find a more suitable host). In the meantime you may find it useful to read my 'get you started' page which includes a sample basic feed - I'm not suggesting you should write your own feed, but it would give you an idea of the requirements and what a feed should look like. http://wilmut.uk/pc