How to become certified?

How to become Certified? (as I understood, by paying for Pro account, the AppFutura cannot guarantee to certify you.)
What is the difference between Pro and Certified?
Why am I allowed to submit only featured proposal?
What does it mean "negotiating"?(on each job proposal)

Hello people at Onix Systems,

Someone in the AppFutura team will shortly get in touch with you in order to start the Certification process and clearing all other doubts you have about our platform. Stay tuned!