Follow these steps to redeem your V-Bucks:

  1. Go to and log in to your Epic Games account.
  2. Hover over your name in the top right corner, and then click V-Bucks Card
  3. Click Get Started to begin the redemption process. 
  4. Enter your PIN-code and click Next.
  5. Select the platform you want to redeem the V-Bucks Card on, and then click Next.

Note: You can find the official instructions here