set up on Rb150

I followed the instructions here http://wiki.mikrotik.com/wiki/How_to_Connect_your_Home_Network_to_xDSL_Line

Everything works fine but I would like to use ether 3 and ether four for other computers.
They are enabled but I get no internet from them. Only on ether 2.

Can someone tell me the next step to sending signal to ether 3 and four.

thanks

Create a bridge interface.

/interface bridge add name="bridge1"

Add Eth2/3/4 to the Bridge.

/interface bridge port 
add bridge=bridge1 interface=ether2 
add bridge=bridge1 interface=ether3 
add bridge=bridge1 interface=ether4

Change the interface for your private IP from eth2 to the bridge interface. IP → Addresses

Change the interface for your DHCP server from eth2 to bridge interface. IP → DHCP Server

That should take care of it.