dahua nvr - "config" button missing

[gtr]

Hello everybody,
after changing password for admin acc on dahua NVR 3104-p, when I login to NVR via IE, the "config" button is missing on top of the page!
There are monitor/search/about and logout.

How will I get beck that button?

Thanks

 

[gtr]

Maybe if I find some way to reset the NVR, maybe I will can use the default password and access to settings via IE? If I reset the NVR, all settings will be deleted, including DDNS settings, but I dont know those settings, because I didnt set it up....
Is there any way to read out DDNS password from NVR?