To configure your smart beam.
Power it on and either physically connect your computer to one of the lan ports labeled 1-4 or through the wireless (the lan ports are preferred)
in your browser type in 192.168.0.1 you should then see the log in page. the defaults are Admin and the password XXXXX XXXXX If you have changed them you will need to enter the correct information.
The manual is not entirely clear, but you can click around.
The two things you need set are
Internet Connection Type: My Internet Connection is: "Dynamic IP (DHCP)
Network Settings > DHCP Server settings: UNCHECK the "Enable DHCP Server" check box.
You can also go to the wireless settings page and configure your wireless network as you like. There is a wizard option there which should be very easy.
Once you are done look for the save or apply options.
When that is done. Disconnect from your Smart beam and connect the "Internet" port to any of the open ports on the N300+ you should then be able to use it's wireless and wired options without any issue.
If you need clarification or further assistance please let me know