How to place a limit order?

A limit order lets you buy or sell at a fixed price that you determine, and sometimes you’ll get a better price depending on how the market moves.

To place a limit order, you need to click the trading pair you want to trade and go into the trading page -

Choose limit order, and put the target price and amount you want to buy or sell. The deal will be filled once the market situation meets your requirements.

You need to keep in mind that there's no guarantee the order will completely fill (or fill at all).