When you have steem, you can go to the market (arrow to the right), and sell some steem for steem based dollars. Usually you get around 1.25 sbd for 1 steem. Then get blogging and commenting. Copy a link of a post, go to sbd wallet, transfer, send 1 sbd to randowhale, and in the memo paste the link. Done. That post is now worth between $1 and $2,20.