Hi what exactly is referral signuo bonus, it says you are suppose to receive .50cent as soon as one of your referrals reach a dollar in clicks, one of my referrals has reached that, but I didn't receive anything yet, what am I missing here?

You get the sign up commission when your referral crosses the $1 earnings in PTC clicks and you should be Premium at that time. Otherwise you will not get the commission.

In your case now, it seems that your referral crossed the $1 clicks when you are Standard -- and hence you didn't receive anything.