How can I set up the Huawei router?

I'm currently trying to get my Huawei router E5576-320 to work. I also watched the videos, but another window opens with which I can't start. Do you have any idea what exactly is asked.

I have already tried my Wi-Fi password, the device pin, the model and none of the words match.

If you have the SIM card in your mobile phone, you have to enter your code when you switch on.

Since this is impractical with the router, I switched it off, otherwise you always have to have the router connected to a computer, mobile phone or tablet with a cable to switch it on.

How it works? The easiest way is to put the SIM card into the mobile phone and then under Settings.