Scroll to the bottom, and in the menu items on the far right you will find History, then click on the appropriate item in the Accepted row, Remove button top right of each image.

I also can't delete files, I know how to do it, but it just doesn't work. I have deleted a number of files, twice, which was very tedious. I started deleting files (to move them exclusively elsewhere) over 3 months ago and I've been checking in and still they haven't been removed. I've contacted support who don't care (told me to wait a week) and after a week, with no change, and with must frustration I told them I would just close my whole account and they said sure, but we'll keep all your money, as per your agreement. Wow, it takes me quite a while to even get to payout, and they want to keep my piddling $50? I'm not sure who is more desperate, me or them...   I feel quite sad as I have a soft spot for these guys, being my first ever stock agency I tried out.

I was going to let them have the money but actually, that's wine money, and it's MINE dammit.   so here I am, still plugging away, pressing that "remove" button. after the 15th and I have my money, if the issue isn't resolved, then I will pull the plug.