The links attached are for videos which show how to configure the Nanostation which I think will help you to understand the configuration.
A word of warning make sure that you only connect the radios to the PoE ports to the Injectors and do not connect the PoE ports to any other device such as a router or pc or it will fry the network port on the LAN ports!
First video shows old Nanostation M5 and a good description on how to fix the window mount at 6.22 to the NanoStation.
In the first video the AirOS is an old version but still the same setup except that before you had to enable WDS while in the new version this is now enbled automatically for the Ubiquiti products can talk to each other.
Second video shows the setup of the new NanoStation AC and the latest AirOS setup which is the same as for the AC Loco
Remember to change your Ethernet adaptor on your pc to Obtain an IP address automatically again once the radios have been configured!
Hope this helps.