Recording CCTV fooatge to a 4tb wdmycloud

Hi, i am having problems trying to get my hikvision cameras to work with the ftp function on WDMYCLOUD.
The nas drive is plugged in, can be seen on the network. Works fine. I have enabled the ftp function on the nas drive.
My cctv cameras can be seen on my network and have the ability to use ftp. However when i try to use it. It asks for a username, password which is used for the ftp folder. I have tried all my profiles passwords for the nas drive. But they are incorrect. I am also unsure what the correct filepath is to be used. At this point i am scratching my head. Any help would be grately appreciated.

Thanks in advance
Bobby

Thankyou for a reply ill have a go tonight when i finish work. Ill let you know how it goes
Thanks
Bobby