If you are not sure how to use the Market Order then follow this simple step-by-step tutorial below.
Navigate and log in to chainex.io
Navigate to the markets page by selecting “Markets” on the top right or by selecting the relevant market from the left hand side bar.
Select the "Market Order" tab above the Buy/Sell order input dialogs
Enter the amount you wish to Buy or Sell in the Buy (left) or Sell (right) amount input
Click the Buy/Sell button below the input
Ensure that you are satisfied with the values calculated on the confirmation loaded
If you are satisfied, select the "Yes" button on the confirmation
Orders will now be placed and executed automatically against available orders until your specified amount has been bought/sold.
For more information on what is Market Order, click here.
See if you are restricted to any trading limits - What does my Profile Verification level mean?