The Proroute H820WRT has the same web configuration interface as the H685WRT router so you can see the configuration for the initial set up of the router below which applies to both the H820 and H685.
Please watch the video below which will guide you through the basics of router configuration
The full user manual is available by using the menu at the top of the page – here is the link as well for you.
DEFAULT IP ADDRESS : 192.168.8.1
DEFAULT USER NAME : admin
DEFAULT PASSWORD : admin
DEFAULT WiFi PASSWORD : m2mrouter168!!!