Welcome 
It’s not about the number of posts. You will get the ability to add a signature after you’ve been a member here for 90 days.
Yes, be patient. Your membership maturity date is in Aug 2011. By the time, you will be able to add your signature.
This guy is clearly looking to become a contributing member of this forum 
I’m willing to bet we don’t see another post from this guy until August when he can fill his sig with spam.