Go to Trade and select order type accordingly.
Limit Order: A limit order allows the trader to specify a price and amount they would like to buy or sell. Then the order will be added to the order book and will be waiting for someone to accept it.
Note: BTC Transaction fee is displayed to 4 digits after the decimal point and CNY to 2.
Market Order: Market orders are often used when rapid execution is prioritized over the price at which the order executes. A market sell will match the best available bids on the order book, and a market buy will match against the best available asks on the order book. When placing this order, the trader prefers the trade to happen immediately at the current best price available.