There is a display block in every lab kit in the upper left hand corner, known as "comp block 0" on the JTerm GUI. You must let JTerm know about the display block by selecting "Display Block" from the Block Function pull-down menu in the comp block 0 dialog box. You must also let JTerm know that you intend to display the number on the serial input by clicking on the "Display binary input" checkbox. Don't forget to click on Configure Kit when you're done to commit the changes to the kit.