Step-by-Step Guide: Create an account at Keybase. Verify your phone number from a country that is mentioned in the official announcement. Free XLM will be credited to your Stellar wallet automatically on the 15th of each month. The total airdrop value of each round will be divided equally among all participants. Current airdrop value per person as of 2019/11/26 is 434 XLM (~ $25) if no one else registers. See the official Keybase announcement for the exact current value per person and find more details about this airdrop.