You're too late man, I think many holders already know the airdrop has been distributed since January 11 2021 [1] but no problem at least you still get the reward.
If you trade DIA on hoo exchange or Binance exchange
Not only on hoo or Binance exchanges, all CEXs and DEXs exchanges are eligible to get the reward as long as the exchanges support/list DIA.
[1]
https://airdrops.io/dia/