Unfortunately, the code had expired. Thanks anyway.
Step 1. Register an account here https://www.flexclip.com/ and confirm your account through email.
Step 2. After clicking the “Upgrade” button (under user avatar on the drop-down menu), Choose the “Basic Annual” plan to move this forward.
Step 3. Paste the coupon code into the code box after clicking “Have a coupon?” and click “Redeem”. You will be notified with a message “You’ve successfully redeemed coupon code!”
FlexClip Redeem Code for 1-Year Basic Plan: ComputerBildFC
Confirmed. Thank you boss.