After proper installation, Cygnet icons can be located on your Windows desktop as well as the quick launch bar on the Windows taskbar. Double click or single click respectively to launch Cygnet.
The first time you launch Cygnet you will see the Serial Port prompt window as pictured below. Click on the 
button to choose the COM port that your NeuroAmp is assigned to.
for more on launching cygnet, and a video on selecting a com port and setting up the NeuroAmp with cygnet, click here for the section on connecting your NeuroAmp