Megalido I've heard is now has a different amount of days in order for you to get paid. It use to be 12 percent in 12 days and now it's 12 percent in 36 days. Now it will be even more difficult to get referrals.
Basically from referrals I believe you get a percentage back of there earnings or investment. You may want to check out the FAQ page if it has one. If not contact support.