You’ll need to contact firstname.lastname@example.org to get your game in a public beta. If they approve, your game will be exposed to K+ users for playing and comments. Then you can officially publish after you are done with your beta. Not much else.
I just did a quick search and found another thread asking your question here.
Hey, do you like games? So do we — that’s what makes Kongregate the best source of free games online. We have thousands upon thousands of free online games, from both one-man indies and large studios, rated and filtered so you can play the best of the best. Read more »