This Router is an a**
the address to access the attached drive without the SharePort feature is not stated anywhere.
and the "solution" is one that links to itself with multiple solutions for different series...
to use samba (windows file sharing) so you can transfer and delete files from the comfort of your pc.
The DLNA server, is pretty straight forward, no complaints there

use the address below to make the drive accessable from your pc. and not 192.168.1.x or the like.
\\dir-890l\whatever_name_the_drive_has_been_given_by_the_router
I used a loong time to figure it out since D-link is an a** and promotes it's own software SharePort or get theirs Dlink NAS' etc.
I used an old laptop drive with an enclosure to stream videos to the iPads using the Infuse app, VLC for ipad is also fine.