In addition to uploading documents you can also delete, rename and re-arrange them in your various collections.
To delete documents:
1. Select the document that you want to delete or check the selection check-box (top left icon) of each document if you wanted to delete multiple documents at once.
2. Click the wrench icon that appears when the document's icon is hovered over or in the top right of the window for all selected items.
3. Click delete to delete the document or documents.