Right-click the FPS Monitor tray icon (bottom right of Windows taskbar) and select "Settings" or "License."
You will see a field labeled "Activation Code" or "License Key." Carefully type or paste your code. Pro tip: Copy exactly. Do not add extra spaces. fps+monitor+activation+code
Let’s clear up a major misconception immediately: You are not looking for a code to type into your ASUS or LG screen. Right-click the FPS Monitor tray icon (bottom right