Installing modules on the Wifi Pineapple is incredible simple.
You will first need to make sure it is connected to a network. I was able to do this with a USB to ethernet adapter that was plug and play.
Next you will want to navigate to the Modules sections on the left hand panel
Then select Get available modules and the available ones should appear for download.
I am going to download the Evil Twin portal as I have heard great things about it
Once installed it should appear under the installed tab along with other modules that are installed
I pinned it to the side and we have our active module!