Under the rewards tab, tap get more tickets.
Then, tap "Refer friends"
Tickets are awarded when someone signs up for Delphia and opens an investment account using your referral code.
Tickets are a one-time bonus that will be added at the start of the next contest.
After your friend has registered for a Delphia investment account both you and your friend will receive 100 chances to win 10 million. See official rules.