Make sure you have the cryptocurrencies you want to trade in your Decoin exchange balance;
Choose the cryptocurrency pair you want to trade, which is located on the top left side of the exchange, next to the DECOIN logo;
On the bottom left side of the screen, Choose to Sell or Buy by completing the relevant information under the “Buy XXX” or “Sell XXX” boxes. Once the required information is filled in the correct box, you may go ahead and execute the transaction;
Your order should now appear on the bottom of the page, underneath the graph.