Sorry, I think it is my fault. I need to create a good tutorial

It is very simple. If you want to sell bitcoins you go to Balance link and you will see your bitcoin address with Coineta. You have to send bitcoins that you want to sell to that address first

If you want to sell dollars in exchange for bitcoins, you will go to Trade link, select that you want to exchange USD for bitcoins, enter your Paypal email and password and select price that you wish to pay for bitcoins. You will see a table with current bid and ask prices. If you select order type Market your order will be executed immediately at the best available bid price. I wrote a software robot that will send money on your behalf from PayPal. The bot does not log your password anywhere, so there is no incentives for hackers to break into my servers. They would not find anything. But if you don't believe me you can change your password right after execution of your order. Your market order will take just few seconds to execute

I am planning support for Dwolla and other major payment processors, but I want to see first if there is a large enough interest in what I am offering