Hi there and welcome
The manual is pretty light as well, I have it for you here
But to delete content, you need to connect it to your computer.
It then shows as a drive, like a USB Stick and you can via the computer click on a file and delete it directly on it.
If you have any problems, or would like any additional information or assistance, please do not hesitate to let me know.
Else if you can take a second to rate my service by clicking one of the stars at the top of the screen then submit, that would be greatly appreciated.