How Can I use My Huawei MT841 Router as a Switch

I have 4 Computers in my house on different floors.I use the internet on all the 4 Comp's by using autodialing my router.But I want to play LAN games like counter strike and Age of Empires etc. with my brother.The problem is how can I use this MT841 router as a switch.

Please Help!!!

First of all i don't know much about MT841 router but i think to use it for a LAN connection you will need it to switch it to bridge mode.To avoid an interruption of internet access, please confirm the correct settings with your ISP. You can also try port forwarding. Better you contact with your BSNL(ISP) for the bridge mode settings. Have a nice time....

Can u provide me the exact settings needed.

Help would be appreciated