It's pretty possible, you just sponsor somebody that you want to support, and you will be enrolled as a member at the same time! This is covered in the last section of the article, or you can read more on our FAQ: https://docs.hivesbi.com/
Or do you mean @freecompliments great initiative? For that you can click through to their pages or Discord and read about how to get involved! https://peakd.com/c/hive-140084/created