3 PC with one ADSL router modem

Can anyone help me out here....i've been searching the whole forum but still cant find a solution...

firstly i am having 3 computers connecting to a switch...by RJ45 cable....and switch is connected to the router...

my problem is...
i can receive and send file in MSN....but not in ICQ!
and main problem is i wanna host a WarCraft3 game...
but ppl can see the name of my game that i create but they cant join...

i did not set any firewall....and my router seems like do not have port forward ability....
only similar thing i can find is....the following

BRIDGE FILTERING


Enable Filter Yes No
ID Source MAC * Destination MAC * Ethernet type **
1 Block Forward


* MAC address should looks like 000002fa6fab
** TYPE is Ethernet type should looks like a5ff

it seems like i need to input something..and choose to block or forward...so is that port forwarding?

if yes....how do i know the mac address ....?
my computer ip is set as 192.168.1.7
and subnet mask 255.255.255.0

and is there anything ineed to do on DHCP?
it is currently set
User Defined Start Address 192.168.1.2

User Defined END Address 192.168.1.254

so i have to change anything??

pls help....THX!!!