That looks like the Dashboard login page; the MyCloud UI.
Have you done a reset on the device?
What are you attempting to do? The screen capture you posted is the My Cloud Dashboard page. ONLY the administrator account is allowed to access the My Cloud Dashboard. If you have forgotten the administrator password you can reset the administrator password of the My Cloud by performing a 4 second reset.
http://support.wdc.com/KnowledgeBase/answer.aspx?ID=13986
If you haven’t done so already you may want to spend some time reading the My Cloud User Manual (http://support.wdc.com/product.aspx?ID=904) to learn about how to access the My Cloud Dashboard to configure the various options and features of the My Cloud along with how User, Shares and passwords work as well as how to access the My Cloud remotely and locally.
