How to connect Laptop to wifi router simultaneously through WIFI and LAN PORT

I have a BSNL Broadband Modem with a single Port. I am using a Laptop (Dell Inspiron 15R) as well as a Samsung Galaxy S Advance mobile. I have bought an ASUS Wifi Router with 4 Lan Ports. I have connected the BSNL Modem to the WAN Port of Asus Router and am able to connect my Laptop wirelessly. I tried connecting my laptop through a LAN cable by connecting it to one of the port of the wireless router but it is not identifying the network. I want that when I am using my mobile through wifi the laptop can be used by others through LAN so that the speed is high. Is it possible? Please post the settings how to configure the same.

You can use only one adapter at a time.

Sir,
U can use laptop lan by wired or wireless not both
Make sure Dhcp is enabled in the modem lan settings
you Can also use both mobile & laptop by wireless simultaneously

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