It's easy! Just send 0.1 SBD or 0.1 STEEM to @lottobot, and include the URL of the post you want to enter as a memo. @lottobot will then automatically enter you in the lottery! Every 2.5 hours, one single winner will be chosen at random to receive a 100% upvote! For more details, you can refer to @lottobot's introductory post here.
Good luck, and thanks for playing!