Send HIVE (whole numbers like 1 or 5, nothing like 3.7 HIVE) to @steembasicincome with the username(s), including the @ symbol, of whoever you’re sponsoring in the memo. You and they both receive 1 HSBI unit per HIVE sent, sometimes within a few hours but it might take a day. If you want to sponsor more than one person, make sure that the amount of HIVE you’re sending is evenly divisible by the number of people you’re sponsoring, with the usernames separated by commas. Easiest to do it one account at a time though like this.