Virtual keyboard, also known as on-screen keyboard, is an Accessibility feature on most PC operating systems. It's basically like the keyboard on your mobile but for your desktop/laptop, where you can click on individual characters on it with your mouse or touchpad to emulate keypresses on an actual keyboard.
Here's how it looks like on Windows 10:
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Here, you're gonna want to click on the "Options" button, turn on the numerical pad on the very right, and click on the + button 5 times while the game window is in focus.