Visit the official website of Mobile Legends: Bang Bang

Click “Redeem”.

Enter the “Redemption Code” and “Game ID” provided in the box.

Then, click “Send” on the Verification Code part.

Login into the game and click on the in-game mailbox to retrieve the Verification code.

Head back to the redemption Page and insert the verification code.

Then, click “Redeem” to complete the redemption.

Enter your game and collect the Diamonds from the in-game mailbox.