Thank guys, that worked. It took me a while to find the File Share section at the bottom of the page but it was OK after I scrolled up the page.
When I meant clean up the recordings, I did not just cleared the log. I went into each recording by "Listen to Call Recording" and pressing "Delete Recording". I cleared the logs after I noticed that deleting the recordings did not result in clearing up space.
So the question I have is, when you press "Delete Recording" does it actually erase the recording and free up space or do I still need to go to iTunes and manually delete each recording?