I need help

Hello i just installed mikrotik and configured it.

I have 3 ethernet cards i renamed WAN,LAN and LAN2

WAN i configured as a DHCP client, and it gets the ip and the internet from the ISP.

LAN i configured as a DHCP server and i conected a computer to it and internet works fine.

I tried to configure same the LAN2 but when i connect the computer the internet it doesn’t work.

Here i executed the comand export and see what i configured:
http://paste2.org/p/974510

SO my answer is how to configure the LAN2 ethernet card so the other computer can connect to the internet too?

You do not have any IP address or DHCP server configured on LAN2 interface. You can bridge LAN and LAN2 together to use same IP address and DHCP server for both interfaces: http://wiki.mikrotik.com/wiki/Bridge