Yes, upon first boot you should wait a long long time for your firmware to load (blinking amber light). After that, reboot and connect an ethernet from the Pineapple to a laptop. Refer to the manual that came with your Pineapple. Bring up the admin panel in your browser at the super secret ip address specified in your Pineapple manual.
After you hook up with ethernet, then you can configure the Pineapple to connect to your office wifi. After connected to the wifi, you can connect to the admin panel from the wan side through wifi. Or, have the Pineapple advertise as an AP and connect to that directly.