The above entry specifies voltage source at three points with (time, voltage) values of (0us, 0V), (3us, 0V) and (3.001us, 3V) respectively. In other words we entered a voltage source with a rise transition from 0 to 3V at 3us, with the rise time of 0.001us. Place an instance of a capacitor, which you can find under NCSU_Analog_Parts -> R_L_C -> cap. A capacitor will simulate the effect of capacitive loading from the following stages. For illustration purposes, choose a value of 1pf for the capacitor. Place an instance of a DC voltage supply, which you can find under NCSU_Analog_Parts -> Voltage_Sources -> vdc. In the properties window, set the value of the DC voltage to whatever power supply you desire. For our purposes, we will set this value to 3V. Using the wire mode, connect the bottom node of the 3V power supply to the ground net (gnd!).