In order to access the web interface about HG8245H, I require that a device connected via Ethernet or WIFI.
The specifically steps as follow:
1, You should open your web browser (you can use Google Chrome, Firefox, Safari, Edge, or Opera).
2, In the address bar, please type in 192.168.100.1. And there will display a loggin screen.
3, After A login screen appear, it will request a username and a password. So you must type in your username and password.
4, As default, the account is root and password is admin.
5, On the very first login, you will be prompted to change the default password, change it and use something quite simple.
After you finish all the steps, you can tweak whatever you want.
I hope my suggestions is helpful for you.