xbee-Pro 900HP mesh configuration issue

I have Xbee-PRO 900HP digi mesh kit. I would like to configure it in the mesh network. I would like to configure three xbees such way that total setup will follow this thing… The coordinator will send some data in API frame(API mode) to the END via the Router and END gives a feedback to the Coordinator via Router.
My XBee firmware version 8075. Please suggest me how do I configure three xbees(Coordinator, router and End) such that I can fulfill my requirement?