To get your imp ready for an LCD screen, it needs power and a process called "Commissioning" that allows it to connect to a local Wifi connection.
I chose to power this example via USB which requires the addition of a header and jumper on the April development board. Insert the Imp into the carrier and plug in the USB - he Imp should start flashing a variety of colors when the power is applied.
Follow the steps outlined on the Electric Imp website for Commissioning an imp
Once commissioned, you should get familiar with creating nodes for your Imp and perhaps get "Hello, World!"
or some other sample code working before continuing. Some basic knowledge of creating and loading a node is required.