Eusso N 4-port UGL2430-RT Wireless Trouble

Hi all i just bought a new Eusso N 4-port UGL2430-RT:

Im having troubles setting up the wireless connection, if i connect the C&W cable(that comes from their box) to the WAN jack, all PC`s can see the wireless and acces the local network and see each other Saherd Folders BUT they cannot surf da internet.

Thne i tried conectig the C&W cable to one of the LAN jacks and the PC who was setting up the wirless go interte but its was alos conected to LAN jack and still Wireless was useless

Its not a porblem of C&W cuz i also own a Linksys by Cisco Wireless router and works, its just plug and play.

Im using tenda cards model TWL541P compatible with B & G

This are my settings:

Channel: 11 i live at panama so i can use US/Canada Setings Sisco Works with that
Mode: Mixed b/g
DHCP: is set to dinamyc and enable
Wireless SSID Broadcast: Enable
DDNS: Disable<<<<<<<<I really dont know what is this but is disable.

If you need anything else information pics of something whatever just ask, One thing enlish isnt my native lenguage so its kinda hard for me to write well or understand 100% my english is about 84% complete

Thanks in Advance