Bter offers various customer experiences for trading. You may also use a mobile client to sell or buy beside the webpage. If you are interested in programming, trading via API may just suit you well.
Trading on the webpage :
Log in your account and select the market you are interested in, then click the coin pair you want to trade. E.g. "BTC Market" > "DOGE/BTC"
Fill the desired price and amount for a buy order or sell order. Then click the button to submit your order. An open order will be placed, which will fill when there is matching opposing order.