How can i sell module ?

I have a simple and cheap module for selling. I search on the website but i don't find anything.

so how can sell?

You need to be a Premium member to post in the market, which is where you can sell modules.

and read this http://www.boonex.com/trac/dolphin/wiki/MarketTerms

You might want to just set up a website outside of Boonex and sell your Dolphin module.  I am not going to buy a prime license just so I can sell modules; which is really all you get with Prime and evidently the "Trusted Vendor" is something that Boonex tosses out freely since I have issues with a trusted vendor.  As I said, you can sell your modules from your own website.

Perhaps if Boonex would open the market up a bit we could see some of the free modules listed that otherwise go unnoticed.  Who in hades is going to buy a prime license so they can list free modules in the market?

Premium is available on its own for a one-time fee: http://www.boonex.com/memberships

Some members (and moderators) have offered to "host" free modules and stuff on their accounts for people who don't have Premium.  If it's free, legal, and I see value in it, you can message me the details and I can make a post for you.