You say you reset your unit to factory default, you therefore removed any passwords, users etc.
The first thing you need to do is to login using the web UI. Forget using the wizard and go directly to 'Management' --> 'Disk Management' and check your disks (the screen grab you give shows that your RAID array is degraded and you need to fix that first).
When your disks are fully functional you meed to set user login AND password to the unit (they should be the ones you used before to login to the mydlink services.