Can't ad/delete files to new Passport Ultra

WD External Drives External Drives for Mac
2

Hello,

The Passport Ultra comes ready to be use on Windows computer formatted on NTFS and Mac will see the drive as read only and that’s why you are able to see the unit but not able copy or delete files from it.

You will need to reformat the drive to make it compatible with Mac.

See if the following link help; 

http://wdc.custhelp.com/app/answers/detail/a_id/3865/session/L3RpbWUvMTQwNjc0MzE0Mi9zaWQvSzVPS01CLWw=/kw/how%20to%20format%20a%20drive%20for%20mac