Anyone want to help can reply in German. Sorry I had to write it in English. 

I installed my Speed Home Wifi mesh router via an ethernet cable but I can't reach the user interface of the Speed Home Wifi device to change the name of the WLAN signal. 
I tried reaching through http://speedhomewifi and mac adress-speedhomewifi etc. It did't work. 
In my router screen, I see that the IP adress of the router is not correctly assigned. It says 192.168.0.109 as IPv4 address in Mesh Devices screen. 

Also our other devices have problems in getting a working IP adress too. I connected my PC via LAN cable and my pc couldn't get an ip adress, it was something like 192.168.0.xxx. So I had to set a static IP adress from network settings on my devices to be able to access the internet. 
How can we fix it? 

Main router : Speedport Smart 4