1. Open the paper compartment by lifting the catch at the back of the iCT220, and then pull the cover upwards. 
2. Install the paper roll by placing it in the cradle at the top of the device as pictured. Hold it in this position. 
3. Close the lid, pressing the top-center of the lid until it clicks.

Ingenico offers a video demonstration that includes installing paper: Out of the Box: iCT200 Series.