Deleting Document

Dear Sir/Mam,

I had just begun to test Zoho so as to see how can I collaborate online on documents. I uploaded a .xlsx file which I want to delete now. It begins the 'Thrashing..' process to find this "You cannot trash the locked document(s)". I tried many a times but no gain. It neither gets deleted nor do I find the option to unlock it. Please guide on this.

Thanks

Sayed Imran.