Suggest you read pages 12-13 of the manual...
The point of AP mode in the WBR-2310 is to provide a new wireless access capability to a network where there is already another wired-access (Ethernet) router in place, but no wireless access.
The instructions in the manual are relatively clear. Essentially, you:
1. Plug the 2310 into your computer and log in to the 2310's admin system.
2. Change the configuration of the 2310 to make it an AP, and change the default IP address of the 2310.
3. Disconnect the 2310 from your computer and plug it into the original Ethernet router.
Now you have wireless access to the network that is otherwise controlled by the Ethernet router.
This has nothing to do with increasing the distance of the wireless signal reception, as your original question implied. The 2310 is NOT a repeater, and cannot function as such. All you do in AP mode is add wireless capability to an otherwise wired network.
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Bridge Mode vs Relay vs Access Point (AP) / Routers vs Dedicated Access Points (AP)