Visit the LCX Bounty page.
Verify your mail.
Register for an account at LCX. (Mandatory)
Join their Telegram group. (Mandatory)
Similarly, complete different tasks to earn free points.
Complete maximum number of tasks and earn more points to stay on top of the leaderboard.
You can also earn 500 points for each referral.
For more information about the contest, visit this Bitcointalk thread.