You need to make sure that the setting on the camera has the wifi turned on. Then go to your wifi settings on your camera and you should be able to select the wifi that is coming from the camera.
Honestly, I found this to be a time-intensive process, so i just bought an adaptor from the apple store that allows me to take the data card out of the camera, put it in the adapter and attach it to my ipad to download the photos. It's a much quicker process. It seemed to take forever to do it with the wireless attachment.
No. Only the D3200 for now. It doesn't look like the D90 has a wireless adapter. Seems to be only available on the newer cameras.
Click the "Compatible With" at the link below:
We were about 5 feet from the camera when trying to use this device with our D3200 and it didn't work AT ALL. It kept freezing and disconnecting. We weren't able to get even one photo. It is pretty much worthless.
I found this on Nikon's product forum for the WU-1a: Nikon say's "No, the WU-1a does not support the D800. It only works with the D3200.
For the D800, you would use the WT-4a for Wi-Fi connectivity or the WT-5a and the UT-1 together."
This link shows compatibility and forum answers - http://www.nikonusa.com/en/Nikon-Products/Product/Wireless/27081/WU-1a-Wireless-Mobile-Adapter.html?cid=prt-0512-wu1a I didnt see any mention of the D700. Hope this helps,