just received my second payment successfully. But I'm having a question about the referral commission. "You will receive a 12% referral commission.
Refferals: 1Commission: 0.00053310 BTC "
Ok, when will I receive that amount?

Basically what does it mean?
You already received it. Have a look into the transaction history of your bitcoin wallet. If someone registers with your referral link (looks like this:
http://doublebot.com/?a=29739), you get 12% of every payment into this new account.
You can see the affiliate payouts on your doublebot page unter Affiliate Program.
Happy new year!
-Elesmera