Sharing internet by D-link2640u router on Win7

hi,

i have internet connection to my PC (windows 7) by wimax internet connection.
that connect by usb to my pc.
(and check the sharing option on this connection)

then i need to share internet on my pc on wifi by using D-link2640u router,

i connect my pc to D-link router by rj-45 cable.

and setup wifi network but this wifi network did not have internet connection.

how can share PC internet by D-link router?

thanks a lot