Click on my rewards to go into the rewards page. You should see a little blue triangle pointing right. Click on the triangle and a list below it will appear showing the numbers referred from your account. If the list is incomplete, contact a moderator for resolution.
As for how the rewards are issued for new accounts, it seems like if referrals are made very early after initial account activation, each referral yields $6 towards the next payment. Referrals made some time later seems to only yield $3 per referral. There must be a cutoff date on the switchover, not sure when though.
