Can't get network to work

[conoflex]

Bit thick when it comes to networking.
As above, this is how it is set up atm one of these Buffalo WHR-G300NV2-EU High Power 11n 300Mbps Main rig wired to a TP-Link 300Mbps Wireless N Access Point (TL-WA901ND) then wireless to second rig with a TP-Link 300Mbps High-Gain Wireless-N USB Adapter (TL-WN822N)
I have tried everything it says in manuals and on the net but I cannot get it set up, Please someone tell me what the beepbeep i'm doing wrong. (make allowances please pushing 60 now )
trying to get it like this :

 

[conoflex]

Ok thanks very much.
Yes get internet ok, mine says "Network 2 internet access"
just point out I also have my sky hd box connected to buffalo and the connection is fine.

 

[conoflex]

Sorted it now by connecting the cable from my router direct to second machine, but I cannot get network access from main rig to other other but I can other way round.