How do I claim free airdrop on Arbitrum?

Could you kindly explain the process of claiming free airdrops on Arbitrum? I'm interested in participating but am a bit confused about the steps involved. Could you outline the necessary steps, including any prerequisites or requirements that I need to fulfill? Also, is there a specific time frame within which I should claim these airdrops, or can I do it at any time? I appreciate your assistance in clarifying this matter.