DHCP option is disabled when LAN IP is Dynamic on DWL-G700AP

Hi everyone! I bought this D-Link DWL-G700AP couple of days ago and I tried to setup using the wireless wizard. It worked fine with my iPhone but I've noticed that when I tried it on my notebook, it has limited or no connectivity. The IP address I got from the AP is a Private address and not assigned by DHCP. Then I disconnected my iPhone and repair the connection on my notebook and it work. It looks like the AP is not giving another IP to 2nd computer. I tried to setup the AP manually and noticed that when you set the LAN IP to Dynamic the wireless DHCP will be disable. Well, to make it short, how can I configure DWL-G700AP so I can connect multiple computer wirelessly from DSL cable modem.